linux-kernel - Re: stable 6.6: commit "sched/cpufreq: Rework schedutil governor performance estimation' causes a regression

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Message-ID: <CAKfTPtAkYfCYc3giCzbDFLBDNTM-nXjkE8FXMZhvJj_im+Qz0Q@mail.gmail.com>
Date: Thu, 20 Nov 2025 11:55:30 +0100
From: Vincent Guittot <vincent.guittot@...aro.org>
To: Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Viresh Kumar <viresh.kumar@...aro.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Yu-Che Cheng <giver@...gle.com>, 
	Tomasz Figa <tfiga@...omium.org>, stable@...r.kernel.org, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: stable 6.6: commit "sched/cpufreq: Rework schedutil governor
 performance estimation' causes a regression

On Thu, 20 Nov 2025 at 05:45, Sergey Senozhatsky
<senozhatsky@...omium.org> wrote:
>
> Hi,
>
> We are observing a performance regression on one of our arm64 boards.
> We tracked it down to the linux-6.6.y commit ada8d7fa0ad4 ("sched/cpufreq:
> Rework schedutil governor performance estimation").

Do you have the fix ?
https://lore.kernel.org/all/170539970061.398.16662091173685476681.tip-bot2@tip-bot2/

And do you have more details to share?

>
> UI speedometer benchmark:
> w/commit:       395  +/-38
> w/o commit:     439  +/-14