linux-kernel - Re: [GIT PULL] Scheduler changes for v6.8

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Date: Thu, 11 Jan 2024 09:53:29 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org, 
	Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Juri Lelli <juri.lelli@...hat.com>, Dietmar Eggemann <dietmar.eggemann@....com>, 
	Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, 
	Daniel Bristot de Oliveira <bristot@...hat.com>, Valentin Schneider <vschneid@...hat.com>
Subject: Re: [GIT PULL] Scheduler changes for v6.8

On Thu, 11 Jan 2024 at 09:45, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Thu, 11 Jan 2024 at 00:11, Vincent Guittot
> <vincent.guittot@...aro.org> wrote:
> >
> > Could you confirm that cpufreq governor is schedutil and the driver is
> > amd-pstate on your system ?
>
> schedutil yes, amd-pstate no. I actually just use acpi_cpufreq

Bah. Hit 'send' mistakenly too soon, thus the abrupt end and
unfinished quoting removal.

And don't ask me why it's acpi_pstate-driven. I have X86_AMD_PSTATE=y, but

    /sys/devices/system/cpu/cpufreq/policy0/scaling_driver

clearly says 'acpi-cpufreq'. Maybe I'm looking in the wrong place. My dmesg says

    amd_pstate: the _CPC object is not present in SBIOS or ACPI disabled

which is presumably the reason my machine uses acpi-pstate.

I will also test out your other questions, but I need to go back and
do more pull requests first.

              Linus