A very important softirq is the timer softirq (include/linux/timer.h): you can register to have it call functions for you in a given length of time. Softirqs are often a pain to deal with, since the same softirq will run simultaneously on more than one CPU.

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 Importantly, since Linux is a multitasking operating system, it executes several programs simultaneously, and this means each process process must be identified specifically. The kernel identifies each process using a process ID ( PID ), a every instance of process must have a unique PID from other processes which is assigned when the process Oct 11, 2016 · Embedded Linux Conference Europe Oct 11, 2016 Example code. 2 Case 1: Behavior of ksoftirqd itself is mostly the same (note discussion of ktimersoftd below). 25 Softirqs are reserved for the most time critical bottom-half processing. In Linux 2.6 only 2 subsystems directly use it: networking and block devices, but timers and tasklets are built on top of softirqs . Softirqs are declared at compile time using an enum in .

Linux version (nudzo@solaris-devx) (gcc version 4.1.2) #1 Thu Oct 16 01:25:37 CEST 2008 CPU revision is: 0001800a (MIPS 4Kc) Determined physical RAM map: memory: 03fffa00 @ 00000400 (usable) Wasting 32 bytes for tracking 1 unused pages Entering add_active_range(0, 1, 16383) 0 entries of 256 used Initrd not found or empty - disabling

Jan 19, 2018 · The more "individual" ksoftirqd processes you see active means that more of the CPU cores are being used. For example, is an application is designed to use 2 cores, you will see 2 of these "using" CPU time while it manages the interrupts. I recommend reviewing the following page: ksoftirqd(9) — Linux manual pages Oct 26, 2012 · Created attachment 634086 cat /proc/cpuinfo Description of problem: Seeing higher than usual CPU usage by ksoftirqd in CentOS 6.3 as of kernel 2.6.32-220.13.1.el6.x86_64. This is on a server with dual Intel Xeon L5420 processors and 5400 chipset.

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

Dec 23, 2016 · Its 5 steps procedure to setup SMTP client on Linux. Step 1. Add SMTP server entry in /etc/hosts file using vi editor or concatenate using echo command below. I am running nginx process on rhel/CentOS release 6.5 (Final). I can see ksoftirqd and migration processes are taking much of CPU due to which load on my server increases by great extent. I have made | The UNIX and Linux Forums (and launch ksoftirqd in the result or balance between > deferring and serving softirq right-there). > >> But your patch still seems to make sense for the case you described: >> when >> ksoftirqd is voluntarily preempted off and the current IRQ could >> handle the >> queue. Note that ksoftirqd being kicked (TASK_RUNNING) is the sign of softirq Red Hat Enterprise Linux (RHEL) 6.6 or earlier; Stream Control Transmission Protocol (SCTP) association with multi-homed endpoints; SCTP transport failover between end points; Issue. kernel:BUG: soft lockup - CPU stuck for 68s! in sctp_assoc_update_retran_path; Soft lockup hang panic with backtrace similar to: