linux-kernel - Re: Linux 6.10-rc2 - massive performance regression

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Message-ID: <CAHk-=wh170Lme6HHSGa5eM6YNcd01vdkOoPenZ0m7P+Yv6_zxg@mail.gmail.com>
Date: Sat, 8 Jun 2024 09:02:55 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: David Laight <David.Laight@...lab.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 6.10-rc2 - massive performance regression

On Sat, 8 Jun 2024 at 07:44, David Laight <David.Laight@...lab.com> wrote:
>
> I suspect it is due to the changes to the way the scheduler pre-empts
> processes.

The PREEMPT_AUTO changes haven't even made it into the kernel yet,
only a couple of preliminary rcu patches that aren't relevant yet.

So while there's been some scheduler changes in 6.10, they have mostly
been pretty insignificant - mostly some renaming without functional
changes, and one-liners.

Obviously even a one-liner can end up resulting in random oddities,
but could you try to bisect the issue you see to pin it down?

                 Linus