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

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Date:   Tue, 13 Nov 2018 22:26:22 -0800
From:   "Doug Smythies" <dsmythies@...us.net>
To:     "'Rafael J. Wysocki'" <rjw@...ysocki.net>
Cc:     "'Giovanni Gherdovich'" <ggherdovich@...e.cz>,
        "'Srinivas Pandruvada'" <srinivas.pandruvada@...ux.intel.com>,
        "'Peter Zijlstra'" <peterz@...radead.org>,
        "'LKML'" <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>,
        "Doug Smythies" <dsmythies@...us.net>
Subject: RE: [RFC/RFT][PATCH v3] cpuidle: New timer events oriented governor for tickless systems

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.

... Doug