linux-kernel - Re: [RFC/RFT][PATCH v3] cpuidle: New timer events oriented governor for tickless systems

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Date:   Thu, 15 Nov 2018 03:29:58 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Doug Smythies <dsmythies@...us.net>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Mel Gorman <mgorman@...e.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [RFC/RFT][PATCH v3] cpuidle: New timer events oriented governor
 for tickless systems

On Wed, Nov 14, 2018 at 7:26 AM Doug Smythies <dsmythies@...us.net> wrote:
>
> On 2018.11.08 00:00 Rafael J. Wysocki wrote:
> > On Wednesday, November 7, 2018 6:04:12 PM CET Doug Smythies wrote:
> >> On 2018.11.04 08:31 Rafael J. Wysocki wrote:
>
> ...[snip]...
> >> The results are:
> >> http://fast.smythies.com/linux-pm/k420/k420-dbench-teo3.htm
> >> http://fast.smythies.com/linux-pm/k420/histo_compare.htm
>
> ...[snip]...
>
> >> There are some odd long idle durations with TEOv3 for idle
> >> states 1, 2, and 3 that I'll watch for with v4 testing.
> >
> > That unfortunately is a result of bugs in the v4 (and v2 - v3 too).
> >
> > Namely, it doesn't take the cases when the tick has been stopped already
> > into account correctly.  IOW, all of the data points beyond the tick boundary
> > should go into the "final" peak.
> >
> > I'll send a v5.
>
> With v5 there were no long idle durations for idle states 1, 2, and 3 for
> this same Phoronix dbench test.

That's good news, thank you!