linux-kernel - Re: [PATCH v4 RESEND] x86, sched: Use midpoint of max_boost and max

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Date:   Fri, 04 Dec 2020 18:10:12 +0100
From:   Giovanni Gherdovich <ggherdovich@...e.cz>
To:     Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
Cc:     Nathan Fontenot <Nathan.Fontenot@....com>, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v4 RESEND] x86, sched: Use midpoint of max_boost and
 max_P for frequency invariance on AMD EPYC

On Fri, 2020-12-04 at 18:03 +0100, Giovanni Gherdovich wrote:
> Frequency invariant accounting calculations need the ratio
> freq_curr/freq_max, but freq_max is unknown as it depends on dynamic power
> allocation between cores: AMD EPYC CPUs implement "Core Performance Boost".
> Three candidates are considered to estimate this value:
> [...]
> 
> Benchmarks are described in the next section.
> Tilde (~) means the value is the same as baseline.
> 
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
>             ondemand  perfgov  sugov-noinv  sugov-max  sugov-mid  sugov-P0  better if
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> [...]

Hello,

this patch is currently merged in the tip tree, branch sched/core as
commit 46609527577d1def0af29ca5b56cffeeea771ada.

Unfortunately in the original commit message I used "----------" for
making table headers, and git dropped all the commit message after
that sign, i.e. the benchmark results and my signed-off-by.

In this "resend" I replaced the offending sign and the new commit
message should make it intact to the destination tree.


Thanks,
Giovanni