Re: Linux 6.10-rc2 - massive performance regression

[Linus Torvalds]

On Sat, 8 Jun 2024 at 07:44, David Laight <David.Laight@xxxxxxxxxx> 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