linux-kernel - Performance Regression in Futexbench (mm-test) from 6.16.0-0.rc1.17.eln148.x86

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Message-ID: <CAL2CeByLWBf861qdkxt1TD6qpUiuxe7s0XK5C_1C_wkCX9V9cQ@mail.gmail.com>
Date: Thu, 18 Sep 2025 09:35:53 -0400
From: Luke Yang <luyang@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>, Waiman Long <llong@...hat.com>, 
	Nico Pache <npache@...hat.com>, Jirka Hladky <jhladky@...hat.com>, Jiri Vozar <jvozar@...hat.com>
Subject: Performance Regression in Futexbench (mm-test) from 6.16.0-0.rc1.17.eln148.x86_64

Hello,

We've found a performance drop in futexbench from the mm-test
(https://github.com/gormanm/mmtests) of ~30%. We can provide more
detailed results if needed.

In our version of the upstream kernel, the performance drop can be
seen in 6.16.0-0.rc1.17.eln148 and subsequent kernels. Multiple
architectures are affected by this performance drop.

We suspect that the degradation may be caused by one of these two patches:

http://kerneloscope.usersys.redhat.com/commit/dfb36e4a8db0cd56f92d4cb445f54e85a9b40897/
http://kerneloscope.usersys.redhat.com/commit/56180dd20c19e5b0fa34822997a9ac66b517e7b3/

Luke Yang