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

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Message-ID: <q2dp7jlblofwkmkufjdysgu2ggv6g4cvhkah3trr5wamxymngm@p2mn4r7vyo77>
Date: Thu, 20 Nov 2025 13:45:41 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Vincent Guittot <vincent.guittot@...aro.org>, 
	"Rafael J. Wysocki" <rafael@...nel.org>
Cc: 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, Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: stable 6.6: commit "sched/cpufreq: Rework schedutil governor
 performance estimation' causes a regression

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").

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