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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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