linux-kernel - RE: [PATCH v4] sched/freq: move call to cpufreq_update

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Date:   Sat, 16 Nov 2019 07:07:49 -0800
From:   "Doug Smythies" <dsmythies@...us.net>
To:     "'Vincent Guittot'" <vincent.guittot@...aro.org>,
        "'Peter Zijlstra'" <peterz@...radead.org>
Cc:     "'linux-kernel'" <linux-kernel@...r.kernel.org>,
        "'Ingo Molnar'" <mingo@...hat.com>,
        "'Dietmar Eggemann'" <dietmar.eggemann@....com>,
        "'Juri Lelli'" <juri.lelli@...hat.com>,
        "'Steven Rostedt'" <rostedt@...dmis.org>,
        "'Mel Gorman'" <mgorman@...e.de>,
        "'open list:THERMAL'" <linux-pm@...r.kernel.org>,
        "'Linus Torvalds'" <torvalds@...ux-foundation.org>,
        "'Thomas Gleixner'" <tglx@...utronix.de>,
        "'Sargun Dhillon'" <sargun@...gun.me>,
        "'Tejun Heo'" <tj@...nel.org>, "'Xie XiuQi'" <xiexiuqi@...wei.com>,
        <xiezhipeng1@...wei.com>,
        "'Srinivas Pandruvada'" <srinivas.pandruvada@...ux.intel.com>
Subject: RE: [PATCH v4] sched/freq: move call to cpufreq_update_util

Hi,

I tested both Vincent's V4 and Peter's, I called it V1.

8000 seconds intel_pstate_tracer on a very idle system.
Everything was fine.

Vincent-V4:

Maximum time between calls to the intel_pstate driver,
per CPU: 4.00813 seconds: GOOD/PASS

Total entries/exits to/from driver: 90,730:
Consistent with previous tests / expectations.

228,600 aperf clocks / second / cpu.  
Consistent with previous tests / expectations.

Peter-V1:

Maximum time between calls to the intel_pstate driver,
per CPU: 4.00407 seconds: GOOD/PASS

Total entries/exits to/from driver: 96,440:
Consistent with previous tests / expectations.

241,310 aperf clocks / second / cpu.  
Consistent with previous tests / expectations.

Baseline reference:

Maximum time between calls to the intel_pstate driver,
per CPU: 225.03 seconds: BAD/FAIL

Number of durations over an arbitrary threshold of
10 seconds: 379.

Total entries/exits to/from driver: 75,969:
Consistent with previous tests / expectations,
when the issue is present.

226,963 aperf clocks / second / cpu.
Consistent with previous tests / expectations.

I did not do the load no-load energy test.
It is not possible for it to be a problem
if the long duration issue is solved.
I'll do the test, if someone wants the proof.

Kernels were 5.4-rc7 + linux next.
Idle governor was TEO, but this isn't actually relevant.

Tested-by: Doug Smythies <dsmythies@...us.net>

... Doug