Hi,
I have an Intel 3570K and would like to run it in performance mode from
startup so I set the default governor to performance.
I noticed that when I do this, turbo mode does not seem to be activated
on the processor (turbostat shows frequencies of about 3.4GHz rather
than 3.7GHz). If I then while it is running switch to ondemand and then back
to performance, turbo is activated properly and the cpu frequency hits 3.7GHz.
I did a git bisect and traced it to the following commit:
5a1c022850ea5d64c2997bf9b89f5ae112d5ee4d is the first bad commit
commit 5a1c022850ea5d64c2997bf9b89f5ae112d5ee4d
Author: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Date: Wed Oct 31 01:28:15 2012 +0100
cpufreq: Avoid calling cpufreq driver's target() routine if target_freq == policy->cur
Avoid calling cpufreq driver's target() routine if new frequency is same as
policies current frequency.
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
:040000 040000 4e0d340c501120d61e5bb9553420c142037a0beb f4ed149e8563bebd6e2d1e4c56523ff9aed4314b M drivers
Reverting this commit from v3.10-rc3 fixed the problem.
This is using the acpi-cpufreq driver -- there doesn't seem to be any way to
set the Intel P-state driver to performance by default.
Regards
--
Ross Lagerwall
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