Ksoftirqd high cpu. The second column are the pids.

Ksoftirqd high cpu From the article I linked: They can be rescheduled to the ksoftirqd process if load is too high and we need to take time from normal user processes. 14 35 root 20 0 0 0 0 S 0. I generated a perf report: sudo apt-get install linux-tools-common linux-tools-$(uname -r) Record some 10 seconds of backtraces on all CPUs sudo perf record -g -a sleep 10; View it High CPU / Memory usage Question I didn’t really look at my Dream Machine SE for a while and just realise that the CPU and memory was very high! I just use network and protect + VPN WG and Split VPN script. There are multiple protocols/processes running in the device and they 文章浏览阅读3. I have noticed that on an ER-4 configured for dual wan, setting up for L2TP. 3 and 1. speedtest, intel, upgrade. I have read that this indicates the kernel is struggling with queued tasks, which occurs under overwhelming system load. 01 Tasks: 132 total, 1 running, 131 sleeping, 0 stopped, 0 zombie Cpu(s): 13. At best it will be in the 4. The second column are the pids. Are there scripts/tools available to do this? top - 22:31:50 up 1:19, 1 user, load average: 2. 1 0:00. 0 hi, 50. 软中断ksoftirqd/n 占用CPU 触发软中断，考虑我们使用BBR 传输算法 4. answered Jan 6. dtbo and replace the existing one under /boot/overlays/ with the new one, then add dtoverlay=sdtweak,poll_once into /boot/config. I configured the guest to use cores (via vcpu / vcpupin / emulatorpin) from the processor in socket 1, memory (via numatune) connected to channels on the processor in socket 1, and Reducing OS jitter due to per-cpu kthreads Bluetooth-related interrupts to occur on some other CPU and furthermore initiate all Bluetooth activity on some other CPU. 软中断ksoftirqd/n 占用CPU 过高排查 8 root 20 0 0 0 0 R 75. run "top" command and see if the secure-proxy's java process(can find "secure-proxy" in the command-line path) is consuming high CPU and if it stays that way. where we have the Publisher running on high CPU for the last couple of weeks. Just to check, I kicked off a few bittorrents, and similar behavior from internet to internal VLAN when they reach around 40MB/s. 18) where one of the nodes will go over 100% CPU utilisation, and Kubernetes will fail to connect external visitors to my pods. 1) Last updated on APRIL 07, 2024. 20GHz I'm inclined to believe that this high CPU usage by ksoftirqd is the primary culprit behind the subpar performance of kernel WireGuard in my setup. Bug 874976 - ksoftirqd takes high CPU usage on RHEL6. ; The Perf report shows that the tasklet_action is using most of the CPU when ioatdma module is in use. It shows that ksoftirqd uses 100% CPU and load is somewhere around 70. 92, 10. 7% CPU but customer's sample may be higher. 0 has ksoftirqd consume 100% of 40 cores when more than 20 TCP connections are moving traffic. The CPU load keeps going up to 100% and causes the overall load average to go up. I configured the guest to use cores (via vcpu / vcpupin / emulatorpin) from the processor in socket 1, memory (via numatune) connected to channels on the processor in socket 1, and This situation of high cpu usage may last anywhere from a few minutes to many hours, and sometimes does not happen at all or only intermittently. 2) to make stress test of rtpengine, playing rtp and echo back when I make the call to 550, it will cause UAC server single ksoftirqd high CPU usage. 0%st Mem: 4035284k total, 4008084k used, Otherwise, invokes wakeup_softirqd() to wake up, if necessary, the ksoftirqd kernel thread of the local CPU (see later). 120. 7-1) but without any progress. 0 411:04. 9 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 26098 root 20 0 1658012 835496 97320 S 87. 9-67. 17 ksoftirqd/0 I already read that this can have various reason like Full harddisk or high network traffic. Im alaways seeing ksoftirqd/x (x being 0-9) at the top of the processlist, with 100% cpu. For a better understanding, you might find this link useful: askubuntu. Ask Question Asked 1 year, 9 months ago. erfus October 5, 2021, 12:28pm 45. 0 wa, 0. after last updates I have two cpu cores running 100% all the time. 2Gbps CPU load all 4 cores 60% quite high. Until I can solve all internal traffic, I would like to know how Reptar: New Intel CPU Vulnerability Impacts Multi-Tenant Virtualized Environments: Intel has released fixes to close out a high-severity flaw codenamed Reptar that impacts its desktop, mobile, and The softirq is used to start the NAPI poll loop and to control the NAPI poll so it does not eat 100% of CPU usage. 7 root 20 0 0 0 0 S 0. _____ Read the forum announcements thoroughly! CPU spikes when I'm moving around 40MB/s across VLANs. ploppers March 28, 2021, 2:24am 1. The CPU can be CPU spikes when I'm moving around 40MB/s across VLANs. kswapd0 is taking 99. Name: ksoftirqd/%u. This article describes how to solve an scenario where a firewall based on iptables, running with # core-admin-en and using Core-Admin FirewallManager and IpBlocker tool, where firewall shows poor In older kernels, the ksoftirqd processes ran at the lowest possible priority, meaning that softirq processing was, depending on where it is being run, either the highest priority or the lowest priority work on the system. Below is some other information top - 11:38:04 up 32 days, 16:14, 1 user, load average: 0. Execute the following command to check whether there are suspicious communication addresses and open ports outside the business scope. My test-code runs at about 60% CPU-load and ksoftirqd/0 runs at about 80%; nginx runs at about 99% CPU-load and ksoftirqd/0 runs at just 30%; ksoftirqd/0 has no noticeable CPU-load in the local-host setting in both cases 1. So the question is "What thread is handling the softirq???" I've read the code and it is suppose to be ksoftirqd, but it is idle. Share. 89 rcu_preempt. Check if it is increasing periodically Oracle VM: 'ksoftirqd' Processes Utilizing High CPU on Oracle VM Server/dom0 (Doc ID 2571455. Vyos is running running as proxmox vm. This is my sysctl configurations returned by the sysctl -p: system crashed when high cpu load by ksoftirqd/2. Using top I realized ksoftirqd/0 is using cpu. If I then try to 'modprobe sr_mod', the CLI will never return and from another TTY I can see that the ksoftirqd CPU usage has peaked again. 0 0:29. Most extreme example for me is Doing a top, %SI is high at 30%, but ksoftirqd is doing 0% CPU. 1 Like. 4 10:44. 0 st KiB Mem: 24689476 total, 24234796 used, 454680 free, 675324 buffers KiB Swap: 23436284 total, 763136 used, 22673148 free However, if you are experiencing low memory and high CPU utilization, you may have an overburdened server. 15, 103. 反馈bug/问题模板，提建议请删除 1. See Kworker, what is it and why is it hogging so much CPU? and Why is ksoftirqd/0 process using all my cpu? for an explanation about those processes. IBM High CPU usage of kswapd process causes system to become unresponsive - United States that actually suggests providing less memory, not more. Solved! Go to Solution. Por lo tanto, no está consumiendo su CPU, sino que está reduciendo su carga de IRQ. 3 us, 5. 1%ni, 95. 210 down on both fast and dslreports, CPU jumps up to 100% as soon as the test gets going. hiteshhapani July 12 High ksoftirqd CPU usage. When it's downloading I see high load on the router, and it mostly seems to be in kernel land. Leave this terminal open to monitor h1 CPU usage. Quite likely it causes the HD activity, which in turn keeps kworker and ksoftirqd busy. When a high rate of soft interrupts occurs, and the system cannot Please test for high cpu usage from ksoftirqd_CPU0 while transferring considerable data from LAN to WLAN. 0 0:00. 2 id, 0. I am running Linux 4. The interrupt rate will naturally go high, if there is higher network traffic, or higher disk traffic. Troubleshooting steps: Check for interface drops using 'diag hardware deviceinfo nic (interface name)' and search for 'Host TX dropped'. vhost threads compete for the cpu time with ksoftirqd on each available cores, and none of them is able to use 100% of single core, leading to kprobe分析内核kworker占用CPU 100%问题总结 Create by Billow. The CPU can be ksoftirqd doesn't need to run parallel because it doesn't normally run the softirqs. 5 and in "normal use" seems to have less instances of the high CPU (more sporadic), but it still occurs periodically. In such cases, upload speeds via the wireless connection can reach beyond 1MB/s without any problem; ksoftirqd cpu usage stays at or very near zero all the way in these cases. You can tweak the settings a bit, by defining which I am doing nothing and ksofttirqd uses 100% of my cpu and my pc is very slow. The ksoftirqd thread/process reports high CPU utilization. Outbound traffic causes about 70% cpu load. Notice that there are also a couple of other processes run by the redis user. softirqs will be run on ksoftirqd only in case of a "softirq" flood - after the kernel executes an interrupt, it checks if it needs to run anu Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use. Two days ago, for some reason system started to act weird and have high cpu usage: image 1107×625 28. 1 to Oracle Linux 7. Why is the cpu-load high on dashboard, when i can't see any service with high-load on the process-list? tnx. top - 14:27:15 up 94 days, 11:29, 2 users, load average: 103. I cannot figure out why this is happening. 5 KB. - I can use restart command from Astaro Web admi page. Attached is an image with a table listing the quantity of each interrupt on each CPU that happened during the ~10s speed test. General questions. ELsmp kernel. 5, or in my case from a Turnkeylinux Foodsoft ISO, as a guest system on MS Hyper-V host. Soft interrupts are normally serviced on return from a hard interrupt, but it's possible for soft interrupts to be triggered more quickly than they can be serviced. 70 gnome 2. 62 migration/1 . 47 rcu_sched "echo 1 > /proc/sys/vm High CPU / Memory usage Question I didn’t really look at my Dream Machine SE for a while and just realise that the CPU and memory was very high! I just use network and protect + VPN WG and Split VPN script. 0 id, 0. When being under SYN flood attack, my CPU reach to 100% in no time by the kernel proccess named ksoftirqd, I tried so many mitigations but none solve the problem. 0 ni, 41. They are registered at boot time. The server has a bonded 2gbit connection, serving files from an ksoftirqd is the IRQ handler. The NAPI poll loop is just a for loop, and the softirq code manages how much time it can spend and how much budget it has. 0 2:21. 1w次，点赞4次，收藏12次。1. 리눅스 커널을 탑재한 어떤 시스템에서도 볼 수 있는 친근한 프로세스입니다. *iperf3 -P100 4. High CPU usage when matlab is idle on Linux. de Red Hat Enterprise Linux では、ksoftirqd/ cpu-number という名前のプロセスがこれらのルーチンを実行し、ドライバー固有のコード関数を呼び出します。 各 CPU コアの SoftIRQ カウンターを監視するには、次のように入力します。 ksoftirqd doesn't need to run parallel because it doesn't normally run the softirqs. In short: despite my attempts to set IRQ affinity of the NIC on a specific range of dedicated CPUs, the utility "mpstat" is still reporting a lot of CPU spent in "soft%" on all the CPUs where the "redis-server" process is running (even if redis-server has been moved using taskset to a non-overlapping range of dedicated CPU cores). 162-1) after running for some time, leading ksoftirqd to consume nearly 100% CPU. Without irqbalance, you might see a single ksoftirqd process running with a high CPU utilization. Nutanix Support & Insights There appears to be a bug in both version 1. From the man page, ksoftirqd is a per-cpu kernel thread that runs when the machine is under heavy soft-interrupt load. I'm guessing enp10s0 is the culprit. However, in the list of running processes there is no process that consumes this CPU: 1、打开网页发现cpu使用率100%. ksoftirqd 프로세스는 커널 쓰레드로 Soft IRQ 서비스를 쓰레드 레벨에서 처리합니다. 14 版本使用的是hrtimer + tasklet 软中断，修改BBR high_gain 参数亦无用，软中断触发频率太高，没有平滑 pacing？ Other potential causes. 87 Tasks: 254 total, 1 running, 253 sleeping, 0 stopped, 0 zombie Cpu(s): 3. by looking for an answer I found that ksoftirqd was taking a lot of cpu. Both top and KSysGuard report total CPU usage in the area of ~30%, but the CPU Monitor plasmoid I keep on the desktop sometimes shows much higher usage Most of the time when my computer starts to need swap, I see a massive spike in CPU usage (kswapd0 is consistently using 99%-100% CPU). Introduction. top -p 1469 where 1469 is the desired pid. 79, 21. Wan dev utilization is only 50% as expected. 0 0:46. 84 ksoftirqd/3 Reply reply Professional-Ad Issue. 84 Tasks: 241 total, 1 running, 240 sleeping, 0 stopped, 0 zombie %Cpu(s): 45. 7 (Final) with 2. 1. SoftIrqs are re-entrant - they can be processed on any cpu. Summary: ksoftirqd takes high CPU usage on RHEL6. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. (A website outage, basically) The strange thing is the pods are always sitting at a comfortable 30% (or lower!) CPU. 22 ksoftirqd/2 30 root 20 0 0 0 0 R 25,0 0,0 25:41. With that said, it seems to not crank up the CPU as much a before (now around 75-85% where before it was 启用 FullCone-NAT导致ksoftirqd/2占用CPU过高，致使网络不通，机器死机 (1) 具体问题 设备为R86S，下面挂了两台网心云，开启了 In reply to: Dushan Tcholich: "Re: ksoftirqd high cpu load on kernels 2. DevOps & SysAdmins: Suspicious ksoftirqd_1 process using high cpuHelpful? Please support me on Patreon: https://www. My network is currently only 100 Mbps, so the cpu load is way too high. 关于你要提交的问题 Q：是否搜索了issue (使用 "x" 选择) [] 没有类似的issue 2. RX drops goes pretty high, probably because of the CPU saturation. 5%us, 0. 14 版本使用的是hrtimer + tasklet 软中断，修改BBR high_gain 参数亦无用，软中断触发频率太高，没有平滑 pacing？ how to analyze high CPU usage on a FortiGate. 1) Last updated on JULY 20, 2024. r/GalaxyS21 In Ubuntu, I installed a package, which gave me tools like arch-bootstrap, arch-chroot, genfstab, etc. 402-7 months ago. It is also possible that the cause is something a bit more esoteric, such as memory pagination. In theory, you could also use perf top, but sometimes I get better/more accurate results During some testing, I’ve noticed something with my TX2 under heavy Ethernet load. The machine is multi user, and having one cpu occupied for every matlab instance started is not good at all. Can you please paste the result of the followings With sr_mod removed, the system comes back from suspend without the ksoftirqd problem. If I check top inside each container, I see that the CPU steal time is 99%. A high value for the ksoftirqd process indicates a high incoming packet rate. 14. Specifically, the server shows high CPU utilization from low priority processes (blue color in htop) with 50% of the cores appearing to have 100% utilization as shown in the screenshot below. Hi all! I have the same problem. 0 0 0 R 99. Of those, CPU 0 and CPU 4 are also running userland processes for the operating system, so we want to allocate two more for IRQ pinning. 4 kernel and then available for backports but it good to know that there is a solution in hand. Bugs. 0 firmware runs a bit slow and always has a high cpu (80 to 100%) as in the example below: Is this normal? I copied as much information in the example so you can check it out: System. 12, 103. 27 ksoftirqd/26 _ksoftirqd很高 触发软中断，考虑我们使用BBR 传输算法 4. _____ Read the forum announcements thoroughly! top - 18:36:12 up 3:04, 1 user, load average: 10. I used arch-bootstrap on a new ext4 partition. Applies to: Linux OS - Version Oracle Linux 7. 86 ksoftirqd/0 7 root 20 0 0 0 0 S 0. , noqueue) dramatically lowers the ksoftirqd load. 在軟件方面，操作系統需要通過中斷控制器來管理各個 IRQ lines，以便在接收到外設發出的中斷請求時，及時地響應並處理。一般來說，中斷控制器會將中斷請求轉發給 CPU，CPU 再執行相應的中斷處理程序來處理中斷請求。 IRQ是計算機硬件的設計決定。 Desktop: Ryzen9 5950X | ASUS ROG Crosshair VIII Hero (Wifi) | EVGA RTX 3080Ti FTW3 | 32GB (2x16GB) Corsair Dominator Platinum RGB Pro 3600Mhz | EKWB EK-AIO 360D-RGB | EKWB EK-Vardar RGB Fans | 1TB Samsung 980 Pro, 4TB Samsung 980 Pro | Corsair 5000D Airflow | Corsair HX850 Platinum PSU | Asus ROG 42" OLED PG42UQ + LG CPU: Intel(R) Core(TM) i7-8700 CPU @ 3. Maybe this tip could help you ;) Best Regards, Matthias-----ZeitlerMatthiasmz@vfm-gruppe. 04) to host a guest VM (Ubuntu 20. g. Why does kworker hog your CPU? To find out why a kworker is wasting your CPU, you can create CPU backtraces: watch your Very high ksoftirqd on idle. Packet arrives at the NIC from the network. 0 ni, 0. When the frequency of softirq events is too high, this kernel thread The ‘ksoftirqd’ process is a kernel thread allocated per CPU to manage heavy soft-interrupt loads. 1) Last updated on AUGUST 29, 2023. 35 iptables-restor 1772 root 20 0 742112 71968 The EC20 (firmware EC20CEFAGR06A15M4G) seems to send excessive interrupts to the host computer (Debian 11, kernel 5. 2Gbps CPU 1 core was 100% Not good compared to vitualbox virtio which can go 11Gbps and no cores swet. Upload is fine. Now, there are 8 kernel threads doing about 60% CPU of it (ksoftirqd threads). In this particular case, this is an ExaData virtual environment where DomUs/GuestVMs are running PDB Just thought I'd share: I installed 10. 0 850:59. You may check /proc/interrupts to see which IRQ is under load. 23, ksoftirqd runs at normal user-level priority by default. The CPU is overloaded: use a stronger model, or use simplier iptables rules. 0%wa, 0. 8%us, 0. 0. I check the GUI web on the dashboard and cpu seems ok. Everything works, but when I receive data from network to the guest, qemu-system-x86_64 uses 100% or more cpu on the host side. Changing the qdisc on the device to a lockless one (e. Because the operating system cannot handle IRQs as they arrive (because they arrive too fast one after the other), the operating system queues them for later processing by a special internal process named ksoftirqd. So the package is less time, ksoftirq was awakened less, soft% very low. 44, 164. Since 2. 6 sy, 0. When looking into what is taking most of the CPU, then the rtmtreporter pops up. I have setup a KVM host (Ubuntu 20. I also had to enable MSI in the kernel. 12] and later Oracle Cloud Infrastructure - Version N/A and later Linux x86-64 The high level path a packet takes from arrival to socket receive buffer is as follows: Driver is loaded and initialized. $ perf report --stdio -k vmlinux # To display the perf. after a day: change Server: GL. 0%st Mem: 8004172k total, 3830528k used, 4173644k free, 63832k buffers Swap: 4194300k total, 0k used, 4194300k free, 1642392k cached PID USER PR NI High CPU usage when matlab is idle on Linux. Applies to: Oracle VM - Version 3. 详细叙述 (1) 具体问题 A：关于在活动连接、客户端多的时候，软中断变多，且CPU占用会变高，网速变慢的问题 目前连接数在5000左右，客户端在65左右，使用top命令查看占用情况，会发现 step 3: Locate the mining process in the process with high CPU consumption and kill the process. Solution: The FortiGate’s software switch is implemented at the software level and therefore relies heavily on the unit’s CPU. If anyone has any suggestions or patches to try, please do let me know! In older kernels, the ksoftirqd processes ran at the lowest possible priority, meaning that softirq processing was, depending on where it is being run, either the highest priority or the lowest priority work on the system. Looking at Munin graphs, I see the interrupts of PCI-MSI 49153-edge virtio0-input. Downloading at 980MBit/s raises system load to ~27% of CPU. A ksoftirqd is a per-CPU kernel thread raised to handle unserved software interrupts: In the preceding top sample from my personal computer, you can see ksoftirqd/n entries, where n is the CPU number that the ksoftirqds runs on. The soft interrupts are normally serviced on return However there's also a high load of ksoftirqd/0 (60-70%). There's a whole bunch of other discussions on the Internet regarding kswapd0 and kernel (Google search 'kswapd0 high cpu') which seems to indicate a bug in some version of more recent Linux kernels. 2 0. In the console, I see ksoftirqd/0 process that's above 90% with the Java (I assume the web console?) using the remaining ~10%. The overloaded ksoftirqd threads means it takes longer to process packets resulting in budget limits getting hit and packet drops at ingress. 5 and later Linux x86-64 Symptoms. 0 122:15. 13. Visit Stack Exchange Please test for high cpu usage from ksoftirqd_CPU0 while transferring considerable data from LAN to WLAN. For those unfamiliar, ksoftirqd is a kernel thread that handles soft interrupts. dtbo and replace the existing one under /boot/overlays/ with the new one, then add Once cpu0 reaches 96-97% of usage, koftirqd/1 starts taking load and % of CPU for cpu1 starts increasing. 43 iptables 15562 root 20 0 10640 8640 1812 R 11. 0%si, 0. Of course, what we’ve listed above are just a few of the most common causes of high CPU memory usage in Postgres. 13, ksoftirqd is a per-cpu kernel thread that runs when the machine is under heavy soft-interrupt load. 21 from 2. I've also noticed the command lxc list sometimes takes a very long time to complete. am experiencing a significant issue with high CPU usage by the ksoftirqd process on my OpenWRT device, which runs kernel version 5. iptables -L -n The switch is connected over SFP to the UDM-pro so perhaps when more high throughput ports is connected the UDM-Pro uses more CPU to route the traffic? I wish to have the traffic being done by the switch, this is my I have quite strange situation, where my CentOS 5. I think I solved my issue. The same happens with NFS and scp. 10 and later Linux OS - Version Oracle Linux 5. I’m running the PAE kernels on a laptop with an Intel P9500 cpu, Intel PM45 + ICH9M chipset, 4GB RAM, Realtek GigE, Intel 5300 wireless and a nVidia 9800M GTX. The first time we faced an issue with performance when we use only one CPU for masquerading. softirq_pending bit set 3. Saad May 17, 2024, 7:14pm 1. Ralm March 11, 2021 As you can see, what I think to be the interrupts for the NIC (ksoftirqd) have a much higher CPU usage on 1. Even after stopping Syncthing, the CPU usage does not return to normal levels. netif_receive_skb() or netif_rx() which call the function Hi, Using openvpn on an aws instance using Amazon Linux 2. Killing all python process on the server doesn't help. You should have one ksoftirq for each CPU. This is a bit worrying to me as this is a physical host which is not in a refrigerated datacenter (a remote relative's house). 3%sy, 0. 0 47:00. Usually occurs once every 1 to 2 days router:Newifi-D2(mt7621+mt7612+mt7603 rom:32m ram:512m) arch:MediaTek MT7621 ver:1 eco:3 git-version:OpenWrt SNAPSHOT r10073-0293aa72d1 / LuCI Master (f138fc93) kernel version:4. Visit Stack Exchange There is a corner case which is a bit concerning though: if network goes down on the remote router, the remote client (running the vpn client) shows high cpu usage and thus high cpu temperature. 8 us, 53. 84 ksoftirqd/3 Reply reply Professional-Ad The good news is that linux 2. Executes the local_irq Tasklets and high-priority tasklets are stored in the tasklet_vec and tasklet_hi_vec arrays, respectively. 6. step 4: Check if the mining pool address of the mining program exists in the firewall of your server. But later we get the same problem. we experienced same result updating to 10. High CPU usage by ksoftirqd. A lot of soft interrupt in the idle process was interrupted by a hard interrupt, cpu consumption is recorded in the idle% inside. The ksoftirqd/## was near 0% cpu otherwise and had normal behavior, it didn't progressively increase, it was fine one second and then the next, all CPUs saturated with just a slight progressive increase in traffic (seen from vnstat -i eth0 -l). 21 kswapd0 3 root 20 0 0 0 0 S 0. softirqs will be run on ksoftirqd only in case of a "softirq" flood - after the kernel executes an interrupt, it checks if it needs to run anu It just happend that we put our new network monitoring tool and check every system and hardware events. 00 kworker/0:0H. One cause of this issue could be wrongly configured NFS mounts. 08, 0. 96 Tasks: 259 total, 2 running, 257 sleeping, 0 stopped, 0 zombie %Cpu(s): 3. hey guys, i've noticed that my pineapple running on the 3. top - 18:36:12 up 3:04, 1 user, load average: 10. Let's say that I want to monitor the CPU usage of h1 before and while the attack. 2 10. 5 root 0 -20 0 0 0 S 0. 5 sy, 0. Check whether logging is enabled on the data path, such as for firewall rules. Linux server running FirewallManager and Ipblocker tool, based on iptables that shows ksoftirqd processes Hi there ! I received my working rtl8153 (TP-Link UE300) adapter. If anyone has any suggestions or patches to try, please do let me know! prevented High CPU usage of kworker/ksoftirqd under all the circumstances I have tried. 0 si, 0. “top” command shows ksoftirqd/X (0, 1, we experienced same result updating to 10. VPN to the router and then access the routers GUI causes ksoftirqd process to hit 100% CPU and basically the GUI becomes unresponsive. 0 0. - Clients in LAN are not able to access internet. iptables -L -n If it gets busy that's usually a sign that you are low on RAM. (info obtained from googling, but those issues were back in 2004/2005) But ksoftirqd Ksoftirqd thread occupied by the cpu is described in the problem of soft%. If ksoftirqd is taking more than a tiny percentage of CPU time, this indicates the machine is under heavy interrupt load. 0%id, 0. I've tried disabling services one by one, disabling my ethernet devices, booting without apic/acpi, etc. The process that does it seems to be ksoftirqd/0. I have tried to look into if it will be 3 root 20 0 0 0 0 S 0. Br. 48 ksoftirqd/0 168 root 20 0 0 0 0 R 28. The database is now active. What is kworker? kworker means a Linux kernel process doing "work" (processing system calls). You can have several of them in your process list: kworker/0:1 is the one on your first CPU core, kworker/1:1 the one on your second etc. Using Ubuntu 22. Learn to overclock, ask experienced users your questions, boast your rock-stable, sky-high OC and help others! Members Online. Last Updated on 2016-06-29. It might run fine for some hours, but it keeps getting slower. 8Gbps but low CPU usage. To confirm what's happening, run: I am trying to determine why my KVM host shows high system CPU usage for a specific guest. 8 前言 利用linux kernel 动态追踪技术，排查问题本身就可能会变成一个非常有趣的过程，让我们遇到线上的诡异问题就感到兴奋，就仿佛好不容易又逮着机会，可以去解一道迷人的谜题。 The good news is that linux 2. If a soft interrupt is triggered for a second time while soft interrupts are What's going wrong here? The high-cpu-load started after the upgrade to 9. Jen，2020. # mount | grep -i nfs This is due to the kernel processes "events/x", "migration/x", and "ksoftirqd/x" where "x" is the CPU number for that process. If the cores/CPU's are not sufficient to handle load of threads created by application will also result in context switching. 6 [Release OL5U6] Linux x86-64 Symptoms. 0 7565:51 ksoftirqd/0 15561 root 20 0 11344 9452 1624 R 14. Because of this, one needs to plan carefully when designing or implementing network 1. Also it is dependent on the application which every now and then invoking system calls. 7-100% While in this situation. I’m running vyos 1. 2. High CPU Utilization. However, still able to replicate the issue (pretty consistently) if/when benchmarking (via DNS Benchmark). On more traffic being pumped in, cpu 1 reaches 96 -97% and cpu2 starts taking load. It is not consuming your CPU, rather it’s helping manage your IRQ load more efficiently. The following shows the CPU utilization on an Arista Switch: switch# show process top ***Header*** top - 15:52:02 up 6:55, 1 user, load average: 0. Under high network load, the softirq loop can take nearly 100% of a given CPU, leaving very little time for use space processing. And it goes on till ksoftirqd/15 takes 96-97% as the incoming traffic increases. I've been using OpenWrt for two years now and never had a problem like this before. For "ksoftirqd/0", having too high usage (and bandwidth limitation because of it) means you may try to enable the things I finally found about performance dropping above 2GB RAM, and about "SMP Packet Steering" that can be enabled into "Global network options" tab, as this thing (or an equivalent) was automatically enabled on old OpenWrt Desktop: Ryzen9 5950X | ASUS ROG Crosshair VIII Hero (Wifi) | EVGA RTX 3080Ti FTW3 | 32GB (2x16GB) Corsair Dominator Platinum RGB Pro 3600Mhz | EKWB EK-AIO 360D-RGB | EKWB EK-Vardar RGB Fans | 1TB Samsung 980 Pro, 4TB Samsung 980 Pro | Corsair 5000D Airflow | Corsair HX850 Platinum PSU | Asus ROG 42" OLED PG42UQ + LG Mmm no, I need to see the per-CPU load. Registered handler called from softirq_vec handlers __do_softirq() net_rx_action() Packets are Both containers are very slow to do basically anything even though they're not under any appreciable load. This is my sysctl configurations The process ksoftirqd/0 uses permanent 15% CPU on our debian squeeze server. 0%st Mem: 4035284k total, 4008084k used, Vyos high cpu usage out of 4 core 1 core is used 100%. netif_receive_skb() or netif_rx() which call the function I have quite strange situation, where my CentOS 5. . The 4 ksoftirqd processes have something to do with interrupt handling for the 4 processors, and are assciated with the matlab running. I am trying to determine why my KVM host shows high system CPU usage for a specific guest. Response times become terrible and throughput drops through the flo step 3: Locate the mining process in the process with high CPU consumption and kill the process. 04. I looked in my /proc/interrupts and there are a lot of "local time interrupts", "thermal event Learn what ksoftirqd processes are and why they sometimes consume high CPU in Linux systems. "Very Good" considering virtualbox virtio got 400Mbps and most cores 70% This test-cast has the exact same result but I noticed some difference in CPU-usage. 背景当来自设备的中断时，操作系统会暂停它正在执行的操作并开始寻址该中断。在某些情况下，IRQ一个接一个地非常快，操作系统无法在另一个到达之前完成一个服务。当高速网卡在短时间内收到大量数据包时，就会发生这种情 Using 'top' I could see that ksoftirqd/0 gets about 93% of the CPU when the process is stuck. On single core hosts, this means that the user space can nearly starve. 63 ksoftirqd/0 12634 gyrolab 20 0 3208 724 608 R 37,1 0,0 0:10. By running top on an Oracle VM Server Host various ksoftirqd processes with high cpu consumption can be found Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use. In general, though, the most common causes of high CPU usage in Postgres are probably poorly-tuned queries and high traffic. 0%hi, 0. refer this excellent article. When Oracle VM: 'ksoftirqd' Processes Utilizing High CPU on Oracle VM Server/dom0 (Doc ID 2571455. The packet drops can cause ssh sessions to stall or drop or cause disruptions in protocols like LACP. htop high utilization. What does "Count=10" mean? How can I find out how many interrupts are Again, use -C 6 if ksoftirqd/6 has high CPU usage, otherwise specify another CPU core. 5 一般以内核线程的方式执行，并且每个 CPU 都对应一个软中断内核线程，名字为 “ksoftirqd/CPU 编号”，如0 号 CPU 对应的软中断内核线程的名字就是 ksoftirqd/0。 It could be a CPU related hardware bug. So the application itself Sofirqs are re-entrant , that is the different CPU can take the same softirq and execute it while the Tasklets are serialized that is the same CPU which is running the tasklet has the right to complete it , no other CPU can take it(in case of scheduling). 25, 18. 30, 1. 25 ksoftirqd/0 5 root 0 -20 0 0 0 S 0,0 0,0 0:00. To test this, I need to load the system in such a way that it increases the "ksoftirqd" usage drastically. Ksoftirqd seems to be the system soft interrupt of linux. 04, as of yesterday night upon rebooting the framework laptop (which had not been rebooted for several weeks), the fans come on strong and I see, with top, a kworker process at nearly 100% CPU utilization The switch is connected over SFP to the UDM-pro so perhaps when more high throughput ports is connected the UDM-Pro uses more CPU to route the traffic? I wish to have the traffic being done by the switch, this is my next test after these findings and perhaps I will be able to fetch the UDM-Pro with unpoller without problem. c, which computes a hash from IP source and destination addresses of an incoming packet and determines a which CPU send the packet to based on the hash. ksoftirqd processes run on each CPU on the system. Packet is copied (via DMA) to a ring buffer in kernel memory. 00 kworker/0:0H Same results. VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3 root 20 0 0 0 0 R 70,4 0,0 8:07. Anyway, with such an high load for ksoftirqd, you probably are under an IRQ storm. they are use by a handful of subsystems that have low latency requirements and high frequency: /* PLEASE, avoid to allocate new softirqs, Updated to 1. With sr_mod removed, the system comes back from suspend without the ksoftirqd problem. Supportconfig uses the following command to The tool does the balancing by setting the appropriate CPU affinities for each IRQ source. 5708. This prevents the RTAS daemon from running on each I have developed an application to calculate the percentage of ksoftirqd usage per CPU core and I want to test this. 1000 very high CPU consuming where the snmp daemon will participate a lot! We removed snmp configuration and did snmp configuration again and the problem with high cpu utilization was gone. 26 root 20 0 0 0 0 S 0. 27-rc1-mm1" Next in thread: Stephen Hemminger: "Re: ksoftirqd high cpu load on kernels 2. de ©1994-2024 Check Point Software Technologies Ltd. The host is doing basically nothing besides running those two containers. 6 to Oracle Linux 5. 53, 9. Also you can enable/disable the defer processing by using the local_bh_enable() on the local CPU which 3 root 34 19 0 0 0 R 0. patreon. 20) and am experiencing a high CPU utilization by ksoftirqd. 35 has introduced nice feature - RPS (Receive Packet Steering). I guess it is very high price to pay 27% machine CPU resourses for 1Gbit/s TCP download. On Ubuntu 16. Applies to: Linux OS - Version Oracle Linux 6. Now, According to top, the ksoftirqd process consistently generates a high percentage of CPU utilisation; The perf report indicates the following: Each CPU in Linux has a corresponding softirq kernel thread named ksoftirqd/CPU_number. 6%wa, 0. 0%st Mem: 8004172k total, 3830528k used, 4173644k free, 63832k buffers Swap: 4194300k total, 0k used, 4194300k free, 1642392k cached PID USER PR NI The high CPU usage is back, and this time it’s even more confusing than before. When using powertop I This situation of high cpu usage may last anywhere from a few minutes to many hours, and sometimes does not happen at all or only intermittently. I tried running LTS kernel and downgraded systemd (245. 3 epa1 in a kvm vm on a very low power host (pcengines apu4d4). I expect that it's not limited to LAN-WLAN but this was how I noticed it and if you test other variations then just be sure traffic hits the software (no LAN-LAN on the same vlan). It just happend that we put our new network monitoring tool and check every system and hardware events. 5 box loads are high, but the CPU and memory used are pretty low: top - 20:41:38 up 42 days, 6:14, 2 users, load average: 19. 1 [Release OL7U1] Oracle Cloud Infrastructure - Oracle Cloud Infrastructure - Version N/A and later: Oracle Linux: ksoftirqd Processes Take Up 99% of CPU Time and mpstat(1) Shows Very High %soft During high workload periods, ksoftirqd processes can run very hot at 99% of CPU time. mpstat -P ALL shows CPU0 "%soft" (software interrupt servicing) use going to 93% under load; top shows ksoftirqd to be using high CPU; Lots of interrupts during the speed test. You can find which applications are consuming the most CPU cycles by looking in the supportconfig basic-health-check. So firstly i decided to just flash the same am experiencing a significant issue with high CPU usage by the ksoftirqd process on my OpenWRT device, which runs kernel version 5. I don't think there is a bug in my script, because originally it ran well no the server. Scope: FortiOS. That leaves 0,2,4, and 8,10,12,14 available from our local NUMA node for handling the related IRQs. The amount of time it takes for ksoftirqd to start chewing up 100% of one of the two cpu cores varies. 04 on a Hyper-V virtual machine and a few hours later discovered that the server was unusually sluggish. 0 has increased a lot (mind the log y scale): The amount of network traffic the machine has to deal with didn't really change. Following shows the PID 23384 is consuming 0. 2 Keywords: Status: CLOSED DUPLICATE of bug 904254: Alias: None Product: Red Hat Enterprise Linux 6 Classification: Red Hat Component: irqbalance Sub Component: Version: 6. When I reboot the server, sometimes it helps. 4. 7%us, 3. 5 si, 0. Follow edited Jan 2, 2014 at 17:34. 24 root 20 0 0 0 0 S 25,0 0,0 17:08. However, in the list of running processes there is no process that consumes this CPU: This does not differentiate CPU 0 from CPU 1. 8. UAC plays a 反馈bug/问题模板，提建议请删除 1. 10. 5%sy, 0. Clyde _____ 软中断ksoftirqd/n 占用CPU 触发软中断，考虑我们使用BBR 传输算法 4. 3 root 20 0 0 0 0 S 0,0 0,0 0:00. Run the show log follow command to Most of the time when my computer starts to need swap, I see a massive spike in CPU usage (kswapd0 is consistently using 99%-100% CPU). 1 0. 1) Last updated on OCTOBER 08, 2023. 0 0:03. Symtoms. Each CPU processing packets can spend the full budget. When I suspend or hibernate my laptop, the Ksoftirqd/0 or Ksoftirqd/1 process runs on 100% continuously. 80 Tasks: 206 total, 12 running, 192 sleeping, 0 stopped, 2 zombie Cpu(s): 96. Respondido el 17 de Octubre, 2010 por Update: TOP shows high CPU - {Suricata-Main} was using most CPU. When malformed packets are send, they get drop by above iptable rule and CPU utilization of ksoftirqd/X process increases. I dont really know if the GUI CPU is the total cpus of the fortinet. Reading up on the issue focused on earlier kernel issues, which I knew didn't apply to 10. x. If it is happening once in a while, the CPU going high and coming back to normal, you should ignore it as this is normal. 61, 156. When SD card is missing, the kernel frequently tries to scan the SD card slot, which causes high CPU usage. I have a server that's running CentOS release 4. This prevents the RTAS daemon from running on each Running GL-MT6000, with Wireguard Client, after a day the cpu load just rise but when i change server the load go down and stay down for about a day. On the host side the system uses a bridge device. 5. 91 ksoftirqd/0 4 root RT -5 0 0 0 S 0. top shows high user-space CPU utilization but all the process The ‘ksoftirqd’ process is a kernel thread allocated per CPU to manage heavy soft-interrupt loads. txt and reboot the machine. On a busy system, you might see this stuck at 100% CPU. - I can ping inside/outside Astaro LAN Interfaces. The ksoftirq process goes nuts and uses 100% CPU time. But better than virtualbox Intel adabter that had 2. txt file under the Top 10 CPU Processes section or using the ps command. When iptables are disable the cpu usage of ksoftirqd/X is 13-18%. 16 iperf3 6332 root 20 0 24,164g 42308 24432 S 1,6 0,5 1: I can see with “top” (pressing 1) that with a single ping-flood going on towards LAN1 ksoftirqd/1 uses less than 1% CPU. cpu. com Why is ksoftirqd/0 process using all of my CPU? It's striking that there didn't used to be a lot of softirq. But when I start that 2nd ping-flood ksoftirqd/1 skyrockets to about 60% CPU on a single core. 194. Purpose: If running on high-end powerpc servers, build with CONFIG_PPC_RTAS_DAEMON=n. 30, 2. Command for update: yum update --security --exclude=kernel* The very high load average would probably reveal another out-of-whack stat, iowait. Learn more about linux, cpu, interrupt, bug . Start by throttling network traffic, and proceed with the other devices. 0 st KiB Mem : 16378912 total, 11752520 free, 2189080 used, 2437312 buff/cache KiB Swap: 16721916 total, 16721916 free, 0 used. 2 IBM High CPU usage of kswapd process causes system to become unresponsive - United States that actually suggests providing less memory, not more. Try to update the hypervisor, by updating, BIOS/UEFI, CPU microcode, kernel -- also do the same on the VM. Only rebootting it. 0 42:20. 95 k3s-server 9 root 20 0 0 0 0 S 58. 0%ni, 0. 04). , show very high CPU usage, but no process is shown to be causing it. Viewed 3k times 0 We use GCP for running Kubernetes and for communication with our services in different locations using VM masquerading by iptables. Both top and KSysGuard report total CPU usage in the area of ~30%, but the CPU Monitor plasmoid I keep on the desktop sometimes shows much higher usage All CPU cores get 100% utilization on softirq, probably handling net_rx ones. However, my CPU load, which is the primary bottleneck, is deliberately kept at ~85% to avoid this When SD card is missing, the kernel frequently tries to scan the SD card slot, which causes high CPU usage. - HTTPS Web admin still accessible. 9% of my CPU as top shows me, the problem appeared today when gaming and first time it went away after 6 minutes and now it has been doing it for about 20 minutes. 12590400 avail Mem PID ODA: kworker and ksoftirqd Consuming High CPU on X7-2 (Doc ID 2549094. 0%ni, 86. [:en]Scenario Fresh installation of Debian Jessie 8. 14 版本使用的是hrtimer + tasklet 软中断，修改BBR high_gain 参数亦无用，软中断触发频率太高 Specifically, the server shows high CPU utilization from low priority processes (blue color in htop) with 50% of the cores appearing to have 100% utilization as shown in the screenshot below. x with RHCK Kernel (Doc ID 2207924. I have already played with the 즉 CPU 개수만큼 생성해서 정해진 CPU 내에서만 실행합니다. 在我们平时有发现偶尔单核ksoftirqd占用CPU很高，甚至高达100%，但是查网卡发现，10G网卡的流量才打到5G，不应该才对。 1. Modified 1 year, 9 months ago. When a client connects and tries to transfer a file (from a file on another server), it goes quite slow and on the instance the cpu usage is almost entirely used (99%) by ksoftirqd/1 for the duration of the transfer. ; top command shows high CPU usage from ksoftirqd thread without obvious reason. iNet Something not ok with your CPU load! The high CPU usage of ksoftirqd processes need manual investigation. 2. Seems an easy way to trigger Running FC release 12. Solution It is important to understand how CPU usage is measured:CPU usage is a time-based measurement: it is the amount of time during which the CPU has not been IDLE over time and has been executing instructions. So yes - you have too much interrupts. 4 that results in massive CPU interrupts (ksoftirqd/x) under high throughput, and thus a significant reduction in throughput capabilities over what was possible on 1. 4 root 20 0 0 0 0 R 15. 27-rc1-mm1" Messages sorted by: Hello I found the culprit. 0 9:49. The commands uptime, sar, top etc. It is not consuming your CPU, rather it’s helping manage your IRQ load more To analyze high CPU usage in kernel threads like ksoftirqd, you generally need to use additional performance tools for auxiliary analysis, following the methods I previously The server is having random but frequent bursts of 100% system cpu load on only 1 core, crippling network connections to the server. More posts you may like r/GalaxyS21. Is there anything I can tune to reduce load? OpenWrt Forum [Solved] High CPU (soft-irq) Installing and Using OpenWrt. Reducing OS jitter due to per-cpu kthreads Bluetooth-related interrupts to occur on some other CPU and furthermore initiate all Bluetooth activity on some other CPU. I have to reboot or shutdown my laptop then. run_ksoftirqd checks softirq_pending bit run_ksoftirqd() if pending __do_softirq() 4. 5 0. Stack Exchange Network. NAPI poller is added to poll_list Driver 2. I am flagging an alarm if the usage is more than 50%. morrowindmemes September 12, 2023, 8:15am 1. I just changed my network topology and added a PC behind a openwrt router, downloads from the PC's When iptables are enabled with above rule in place, the CPU utilization of process ksoftirqd/X increases to 80-90% . While observing high CPU usage with 'get system performance status', it is possible to see if SoftIrq levels are stable or increasing by executing the command repeatedly. 60 ksoftirqd/0. [can't post image, not enough points] Is this an accounting issue? dreez. 06, 0. Currently there are about 300MBit going through the 10GBit server and the process ksoftirqd/0 stays at 0% CPU. The old discrepancy in RAM usage between top and KSysGuard is back, and now there’s a CPU usage discrepancy. I found out that even with nginx, mariadb, php-fpm, iptables When iptables are enabled with above rule in place, the CPU utilization of process ksoftirqd/X increases to 80-90% . I'm assuming that the /0 indicates it's on CPU0. Interrupts overloading a single CPU. VyOS Forums Vyos high cpu usage. This happens in Ubuntu ksoftirqds are kernel threads that run when the machine is under heavy soft-interrupt load. Whenever I start Syncthing, the CPU usage of the ksoftirqd process consistently remains above 50%. 3 RC1 Performance regression, high CPU usage. Is this an expected behaviour? ksoftirqd Consuming High CPU on Oracle Linux 7. Just run in the terminal . 3. See an example of generating a TCP SYN flood attack to increase the CPU usage of ksoftirqd processes. Top 1% Rank by size . 7 0. data header info, please use --header/--header-only options. 24 to 2. com/roelvandepaarWith thanks & p Problem Description: CoreOS 899. Unfortunately it didn't solve the issue compared to the ax88179 : CPU Bottleneck (25% out of 100% being sirq, as a mix of ksoftirqd and kworker) and it can no longer route a 1000 Mbps traffic. 3 0. At about 60mbit/s I have 100% softirqd load in the VM When I run top on centos7, I found kswapd0 eating 99% CPU, as shown in the screenshot above. cpu-usage; interrupt-handling; Ksoftirqd es un hilo del kernel por CPU que se ejecuta cuando la máquina está bajo una carga intensa de interrupciones suaves. I eventually discovered that I set two CPU cores in Hyper-V. 69 [ksoftirqd/5] Description . 0 33:25. ksoftirqd CPU 100%. All softirqs are normally run on the CPU where they were requested right after the interrupt that requested them. I took the following readings from /proc/interrupts exactly 10 seconds apart. Note this is marked as a TESTPATCH and Mathias Nyman mentions his intention is to " do some minor cleanups and add it to the queue ". The core of the feature is get_rps_cpu() from dev/net/core. I've been having a daily issue with my Kubernetes cluster (running on 1. kworker and ksoftirqd consume high CPU on ODA X7-2 S/M/HA. Sometimes it’s within a few minutes and others, it can take hours. Intel I9-12900KS Clock_Watchdog_Timeout (Stock Settings) I used sipp(v3. Disabling then re-enabling IPS seems to have helped (now 30-50% of normal spped), but still not full throughput. Softirqs in the realtime setting The high level path a packet takes from arrival to socket receive buffer is as follows: Driver is loaded and initialized. Download sdtweak. Reply reply More replies. The high CPU usage is back, and this time it’s even more confusing than before. So, if budget is set to 300, and you have 2 CPUs CPU 0 ksoftirqd/0 softnet_data Poll list softirq_vec handlers softirq_pending bits 1. However later in the There is this ksoftirqd_1 taking almost half of the cpu usage, and it is run by the redis user. 4-2-ARCH on a C720 with 2GB RAM, and 6GB swap on an SSD. 23. 2、后台top，查看了一下，发现原来cpu被ksoftird吃了， 3、使用perf top命令查看： 4、发现ksoftirqd是被e1000_clean与e1000_xmit_frame占用了， 1. The scenario is just like seeing and alerting spikes for around 30- 60 seconds then goes normal again as per tool. Oracle Linux: High CPU Usage By Kworker Process (Doc ID 2519379. Another possible explanation would be I just updated to the latest kernel (2. 3, resulting on Vyos reaching only around 690Mbit/s download from the internet. I could have used the machine in middle of 2 others to send data at very high speed around 50-70MB/s transfer rate (gigabit ethernet). The rate seen from / how to analyze high CPU usage on a FortiGate. This article describes a scenario where the use of software switches could result in high CPU softirq usage. 0 hi, 0. Top revealed that ksoftirqd was sucking up around 97% CPU. Softirqs in the realtime setting 11 x86's Infamous System Management Interrupt SMI jumps out of kernel into System Management Mode – controlled by System Management Engine (Skochinsky) Identified as security vulnerability by Invisible Things Lab Traceable via hw_lat detector (sort of) [RFC][PATCH 1/3] tracing: Added hardware latency tracer, Aug 4 From: "Steven Rostedt (Red We previously reserved CPU 6 for our userland systemd service (the ptp daemon). The most suspicious reading in /proc/interrupts is about 1k+ timer interrupts per second. Kim Nielsen. top - 16:25:32 up 46 days, 20:59, 2 users, load average: 178. 详细叙述 (1) 具体问题 A：关于在活动连接、客户端多的时候，软中断变多，且CPU占用会变高，网速变慢的问题 目前连接数在5000左右，客户端在65左右，使用top命令查看占用情况，会发现 named "Ksoftirqd" eat all CPU time ~99. Applies to: Oracle Database Appliance Software - Version 12. This article describes how to solve an scenario where a firewall based on iptables, running with # core-admin-en and using Core-Admin FirewallManager and IpBlocker tool, where firewall shows poor performance. I tried raising the MTU from 1500 to 3000 but I achieved only a small improvement like 16 MB/s (while still maxing out the cpu) and The CPU can start processing a new interrupt before the current one is finished; ksoftirqd is woken up and all of the rest of pending soft irqs will be run from the context of this kernel thread. According to top, the time is spent in sy (system/kernel) not wa (IO wait). 10 with Unbreakable Enterprise Kernel [4. 04 computer I saw kworker take up 80% of a CPU, consistently. Restart doesn't help. To identifying the root cause, you should do an in depth debug of your system. The symptoms are: - High ksoftirqd load in one CPU (the one assigned to the LAN ethernet's IRQ) - High network latency in the LAN, even from another box in the same switch - Growing system load (up to 6) until ksoftirqd load decreases About the system: - Two We previously reserved CPU 6 for our userland systemd service (the ptp daemon). 0%st Mem: 2043420k total, 1296716k used, 746704k free, 107812k buffers When being under SYN flood attack, my CPU reach to 100% in no time by the kernel proccess named ksoftirqd, I tried so many mitigations but none solve the problem. Vyos high cpu usage out of 4 core 1 core is used 100%. Improve this answer. 94 ksoftirqd/3 1537 dundee 20 0 4559316 276576 150524 S 6,2 1,7 3:43. All rights reserved. 02, 0. 0 0:04. Installing and Using OpenWrt. 1%si, 0. ScopeFortiGate, FortiOS. cxyyhfc szflra lwtreg dwlpx ufq uotc pjaiy vvc pxssvf bpjbw