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From: "Doug Smythies" <dsmythies@telus.net>
To: "'Srinivas Pandruvada'" <srinivas.pandruvada@linux.intel.com>
Cc: <linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<x86@kernel.org>, <rjw@rjwysocki.net>, <viresh.kumar@linaro.org>,
	<lenb@kernel.org>, <bp@alien8.de>, <tglx@linutronix.de>,
	<mingo@redhat.com>, <hpa@zytor.com>, <peterz@infradead.org>
Subject: RE: [PATCH v4 2/2] cpufreq: intel_pstate: Allow raw energy performance preference value
Date: Tue, 30 Jun 2020 11:40:24 -0700
Message-ID: <002301d64f0d$ee4bea10$cae3be30$@net> (raw)
In-Reply-To: <20200626183401.1495090-3-srinivas.pandruvada@linux.intel.com>

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



  reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-26 18:33 [PATCH v4 0/2] cpufreq: intel_pstate: Support raw epp and energy_efficiency Srinivas Pandruvada
2020-06-26 18:34 ` [PATCH v4 1/2] cpufreq: intel_pstate: Allow enable/disable energy efficiency Srinivas Pandruvada
2020-06-26 18:34 ` [PATCH v4 2/2] cpufreq: intel_pstate: Allow raw energy performance preference value Srinivas Pandruvada
2020-06-30 18:40   ` Doug Smythies [this message]
2020-06-30 18:35 ` [PATCH v4 0/2] cpufreq: intel_pstate: Support raw epp and energy_efficiency Rafael J. Wysocki

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