From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dirk Brandewie <dirk.brandewie@gmail.com>
Subject: Re: powersave governor runs programs faster and uses more power than
 performance governor
Date: Fri, 25 Oct 2013 07:40:12 -0700
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To: Melanie Kambadur <melanie@cs.columbia.edu>, Viresh Kumar <viresh.kumar@linaro.org>, David C Niemi <dniemi@verisign.com>
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On 10/24/2013 12:42 PM, Melanie Kambadur wrote:
>
>  From /sys/devices/system/cpu/cpuN/cpufreq/scaling_driver I get that
> the current p-state driver is called "intel_pstate". David, you
> mention that the firmware governors are not very efficient, do you
> suggest replacing the intel_pstate driver with a different driver?

I will need to look and see why changing to performance isn't working
correctly.

To get the behavior of the performance governor you can use

    echo 100 > /sys/devices/system/cpu/intel_pstate/min_perf_pct

This will force intel_pstate to select the highest P state and
leave it there.

Turbostat is useful for collecting frequency (P state) and idle (C state)
information.

--Dirk