linux-kernel - Re: [PATCHv6 0/2] *** Detect interrupt storm in softlockup ***

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Message-ID: <ZcY7P7KLDt90XqYE@alley>
Date: Fri, 9 Feb 2024 15:48:31 +0100
From: Petr Mladek <pmladek@...e.com>
To: Bitao Hu <yaoma@...ux.alibaba.com>
Cc: dianders@...omium.org, akpm@...ux-foundation.org, kernelfans@...il.com,
	liusong@...ux.alibaba.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv6 0/2] *** Detect interrupt storm in softlockup ***

On Thu 2024-02-08 20:54:24, Bitao Hu wrote:
> Hi, guys.
> I have implemented a low-overhead method for detecting interrupt
> storm in softlockup. Please review it, all comments are welcome.

I like this work.

I wonder if you might be interested also in reporting problems
when soft IRQs are offloaded to the "ksoftirqd/X" kthreads
for too long.

The kthreads are processes with normal priority. As a result,
offloading soft IRQs to kthreads might cause huge difference
on loaded systems.

I have seen several problems when a flood of softIRQs triggered
offloading them. And it caused several second delays on networking
interfaces.

Best Regards,
Petr