linux-kernel - [PATCH v2 0/1] AMD EPYC: fix schedutil perf regression (freq-invariance)

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Date:   Fri, 22 Jan 2021 21:40:37 +0100
From:   Giovanni Gherdovich <ggherdovich@...e.cz>
To:     Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Jon Grimm <Jon.Grimm@....com>,
        Nathan Fontenot <Nathan.Fontenot@....com>,
        Yazen Ghannam <Yazen.Ghannam@....com>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        Suthikulpanit Suravee <Suravee.Suthikulpanit@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pu Wen <puwen@...on.cn>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Michael Larabel <Michael@...ronix.com>, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org,
        Giovanni Gherdovich <ggherdovich@...e.cz>
Subject: [PATCH v2 0/1] AMD EPYC: fix schedutil perf regression (freq-invariance)

Michael Larabel from Phoronix.com graciously tested v1, see results at:

AMD EPYC 7702 -
https://openbenchmarking.org/result/2101210-PTS-LINUX51178

AMD Ryzen 9 5950X - 
https://openbenchmarking.org/result/2101212-HA-RYZEN959566

The reported regression is recovered, and some workloads even report an
improvement over the v5.10 results.

Thanks Michael for the feedback!


v1 at https://lore.kernel.org/lkml/20210121003223.20257-1-ggherdovich@suse.cz/

Changes wrt v1:

- move code around so that it builds for non-x86 architectures too

Giovanni Gherdovich (1):
  x86,sched: On AMD EPYC set freq_max = max_boost in schedutil invariant
    formula

 drivers/cpufreq/acpi-cpufreq.c   | 64 +++++++++++++++++++++++++++++++-
 drivers/cpufreq/cpufreq.c        |  3 ++
 include/linux/cpufreq.h          |  5 +++
 kernel/sched/cpufreq_schedutil.c |  8 +++-
 4 files changed, 76 insertions(+), 4 deletions(-)

-- 
2.26.2