linux-kernel - RE: [PATCH v4 2/2] cpufreq: intel_pstate: Allow raw energy performance preference value

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Message-ID: <002301d64f0d$ee4bea10$cae3be30$@net>
Date:   Tue, 30 Jun 2020 11:40:24 -0700
From:   "Doug Smythies" <dsmythies@...us.net>
To:     "'Srinivas Pandruvada'" <srinivas.pandruvada@...ux.intel.com>
Cc:     <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <x86@...nel.org>, <rjw@...ysocki.net>, <viresh.kumar@...aro.org>,
        <lenb@...nel.org>, <bp@...en8.de>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <hpa@...or.com>, <peterz@...radead.org>
Subject: RE: [PATCH v4 2/2] cpufreq: intel_pstate: Allow raw energy performance preference value

Hi Srinivas,

Thanks for all your work on this.
I have fallen behind, and not sure when I can catch up.
However...

On 2020.06.26 11:34 Srinivas Pandruvada wrote:

> Similarly on battery the default "balance_performance" mode can be
> aggressive in power consumption. But picking up the next choice
> "balance power" results in too much loss of performance, which results in
> bad user experience in use cases like "Google Hangout". It was observed
> that some value between these two EPP is optimal.

There is a possibility that one of the issues I have been ranting
about could be a contributing factor to things like this.
(I don't know if it actually is.)
One way to compensate is to lower EPP.

I am going to send a new e-mail in a minute about it.
Please consider the possibility that some of these
EPP adjustments might just be programming around the issue.

... Doug