Re: [BUG] local_softirq_pending storm From: Thomas Gleixner Date: Wed May 09 2007 - 12:28:36 EST Next message: Andrew Morton: "Re: [PATCH 3/3] AFS: Implement basic file write support" Previous message: Stephen Rothwell: "[PATCH] early_pfn_to_nid needs to be __meminit" In reply to: Anant Nitya: "[BUG] local_softirq_pending storm" Next in thread: Anant Nitya: "Re: [BUG] local_softirq_pending storm"

"NOHZ: local_softirq_pending 08" warning - Linux forum On the wiki page below illustrating Wifi Direct configuration for the OMAP, the included examples show the kernel warning "NOHZ: local_softirq_pending 08". I believe this means a soft IRQ was scheduled as pending, but was not made ready to run before idle time was to be given. I see this warning in the same fashion as shown in your example. GitHub - karelzak/util-linux Contribute to karelzak/util-linux development by creating an account on GitHub. Understanding Linux Network Internals [Book]

Oct 11, 2009

Jul 24, 2020 · the total time to process pending softirq, if the time exceeds 2 ms we need to wakeup the ksofirqd to aviod large sched delay. Signed-off-by: jun qian IRQ and SoftIRQ: The kernel is servicing interrupt requests (IRQs). Guest and Guest Nice: The process (a hypervisor) is running a virtual CPU. These numbers are already included in User and Nice. Getting the Raw Values. The CPU usage values are maintained by the kernel, in memory. These values are exposed via the proc filesystem, as the /proc The softirq code lives in kernel/softirq.c. Implementation of Softirqs. Softirqs are statically allocated at compile-time. Unlike tasklets, you cannot dynamically register and destroy softirqs. Softirqs are represented by the softirq_action structure, which is defined in :

While studying Linux interrupt handling I found that Tasklets and SoftIRQs are two different methods of performing "bottom half" (lesser priority work). I understand this (quite genuine need). Difference being, SoftIRQs are re-entarant while a Tasklet is NOT. That same SoftIRQ can run on different CPUs while this is NOT the case with Tasklets.

softirq.c - kernel/softirq.c - Linux source code (v5.7.8 - If a softirq needs serialization, let it serialize itself by its own spinlocks. - Even if softirq is serialized, only local cpu is marked for execution. Hence, we get something sort of weak cpu binding. Though it is still not clear, will it result in better locality or will not. Examples: - NET RX softirq. Monitoring and Tuning the Linux Networking Stack Jun 22, 2016 Illustrated Guide to Monitoring and Tuning the Linux Oct 11, 2016 [RFC,1/2] softirq: Defer net rx/tx - Linux kernel