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

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Message-ID: <xhv2eshihzyt3j2tc7oz2gn2gkhucmlnxhoxyrdkxdnxtfwkmb@ebknoqcery5u>
Date: Fri, 21 Nov 2025 12:00:06 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, 
	"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 (25/11/20 11:55), Vincent Guittot 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/

Doesn't seem to be helping.

> And do you have more details to share?

Sure, I'm going to be offline for some days, so I'm trying to
find someone on the team who can take this over while I'm away.
I'll try to help as much as I can before that.