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

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Message-ID: <YA6CqYcaEhUoyJdH@hirez.programming.kicks-ass.net>
Date:   Mon, 25 Jan 2021 09:34:49 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Michael Larabel <Michael@...ronix.com>
Cc:     Giovanni Gherdovich <ggherdovich@...e.cz>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        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>, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 0/1] AMD EPYC: fix schedutil perf regression
 (freq-invariance)

On Sun, Jan 24, 2021 at 04:30:57PM -0600, Michael Larabel wrote:
> From ongoing tests of this patch, it still certainly shows to address most
> of the Linux 5.11 performance regression previously encountered when using
> Schedutil. Additionally, for a number of workloads where not seeing a
> regression from 5.10 to 5.11 Git is still showing even better performance
> with this patch. The power monitoring on the AMD EPYC server is showing
> higher power spikes but the average power consumption rate is roughly
> comparable to that of Linux 5.11 Git, which is higher than 5.10 by just
> about 3%.
> 
> So this patch still seems to be working out well and indeed taking care of
> some wide losses seen otherwise on Linux 5.11 when using Schedutil on AMD
> Zen2/Zen3. Still have some other tests running but so far no unexpected
> results.
> 

Did you do all this writing and forget to add:

Tested-by: Michael Larabel <Michael@...ronix.com>

?