ksoftirqd is a per-cpu kernel thread that runs when the machine is under heavy soft-interrupt load. 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.

0008778: ksoftirqd eats 100% of one CPU core: Description: After upgrade from 7.0 to 7.1 and reboot on some servers we see 100% utilization of one of the cpu cores. Core number varies. Currently used kernel version - 3.10.0-123.13.2.el7.x86_64. After another reboot utilization normilizes. Mar 16, 2017 · perf sched timehist was added in Linux 4.10, and shows the scheduler latency by event, including the time the task was waiting to be woken up (wait time) and the scheduler latency after wakeup to running (sch delay). It's the scheduler latency that we're more interested in tuning. Aug 31, 2016 · Before the patch, the UDP receiver could almost never get cpu cycles and could only receive ~2,000 packets per second. After the patch, cpu cycles are split 50/50 between user application and ksoftirqd/0, and we can effectively read ~900,000 packets per second, a huge improvement in DOS situation. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. [ksoftirqd/1] 1.0 17606 nobody /usr

Sep 11, 2012 · I am using linux as a bridge in a server. when the traffic is about 5 Gbps, the CPU is 10% used, and ksoftirqd is 0% used. But when the traffic is increased to 6 Gbps, the CPU is 80~100% used, and ksoftirqd is almost 100% used. So it is the ksoftirqd that eats my CPU, i think. Is there any

Sep 20, 2012 · To understand what's going on lets have a look how Linux handles incoming packets and interrupts from network card (e.g. Intel 10 Gigabit PCI Express which is placed at drivers/net/ixgbe). Softirq works in per-cpu kernel threads, ksoftirqd (kernel/softirq.c: ksoftirqd()) , i.e. if you have 4-cores machine, then you have 4 ksoftirqd threads Running FC release 12. Im alaways seeing ksoftirqd/x (x being 0-9) at the top of the processlist, with 100% cpu. The server has a bonded 2gbit connection, serving files from an SSD array.

On Tue, Aug 20, 2013 at 08:01:28AM +0200, Tibor Billes wrote: > Hi, > I was using the 3.9.7 stable release and tried to upgrade to the 3.10.x series. > The 3.10.x series was showing unusually high (>75%) system CPU usage in some

man ksoftirqd indicates that: If ksoftirqd is taking more than a tiny percentage of CPU time, this indicates the machine is under heavy soft interrupt load. I'm working with a Debian Wheezy system under generally high system utilization in which ksoftirqd processes utilizes excessive cpu and disk resources for a short period of time. Sep 11, 2012 · I am using linux as a bridge in a server. when the traffic is about 5 Gbps, the CPU is 10% used, and ksoftirqd is 0% used. But when the traffic is increased to 6 Gbps, the CPU is 80~100% used, and ksoftirqd is almost 100% used. So it is the ksoftirqd that eats my CPU, i think. Is there any The Linux kernel o ers many di erent facilities for postponing work until later. Bottom Halves are for deferring work from interrupt context. Timers allow work to be deferred for at least a certain length of time. Work Queues allow work to be deferred to pro-cess context. 2 Contexts and Locking Code in the Linux kernel runs in one of three con- Description of problem: top: top - 16:42:26 up 7:16, 2 users, load average: 2.02, 2.02, 2.01 Tasks: 429 total, 3 running, 426 sleeping, 0 stopped, 0 zombie Cpu(s): 0.7%us, 4.0%sy, 0.0%ni, 95.1%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%st Mem: 16324144k total, 8351792k used, 7972352k free, 627452k buffers Swap: 8191992k total, 0k used, 8191992k free, 2667788k cached PID USER PR NI VIRT RES SHR S %CPU Jul 05, 2020 · In this article, i will take you through 31 Popular ps command in Linux with Examples. As you might be aware a running program is known as Process in System. Linux based OS are a multitasking system so you might see multiple process running simultaneously. The other concept that you might have heard is about a light weight process known as thread.