linux-kernel - Re: [PATCH RFC v3] cpufreq: schedutil: Make iowait boost more energy efficient

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Message-ID: <CAJWu+opLARcOj1qpQmrAkjg7jrthYRqmmtLVASRG+aKmagxnRg@mail.gmail.com>
Date:   Sat, 8 Jul 2017 03:22:57 -0700
From:   Joel Fernandes <joelaf@...gle.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Patrick Bellasi <patrick.bellasi@....com>,
        Juri Lelli <juri.lelli@....com>,
        Andres Oportus <andresoportus@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Joel Fernandes <joelaf@...gle.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH RFC v3] cpufreq: schedutil: Make iowait boost more energy efficient

Hi,

On Sat, Jul 8, 2017 at 3:17 AM, Joel Fernandes <joelaf@...gle.com> wrote:
> Currently the iowait_boost feature in schedutil makes the frequency go to max.
> This is to handle a case that Peter described where the through put of
> operations involving continuous I/O requests [1].

Apologies for the incomplete line here, I'll rewrite the commit
message in a subsequent patch.

I meant to say "This is to handle a case that Peter described where
the throughput of operations involving continuous I/O requests is a
victim of low-frequency and ends up getting 'stuck' in a loop as he
described in [1]."

thanks,

-Joel