linux-kernel - Re: [intel-pstate driver regression] processor frequency very high even if in idle

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Date:	Sat, 02 Apr 2016 08:28:43 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	sedat.dilek@...il.com, Doug Smythies <dsmythies@...us.net>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Jörg Otte <jrg.otte@...il.com>,
	linux-pm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [intel-pstate driver regression] processor frequency very high
 even if in idle


On Sat, 2016-04-02 at 08:30 +0200, Sedat Dilek wrote:
> > I am trying CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y from
> > linux-pm.git#linux-next out of curiosity...
> > 
> > $ ./scripts/diffconfig /boot/config-$(uname -r) .config
> >  CPU_FREQ_DEFAULT_GOV_PERFORMANCE y -> n
> > +CPU_FREQ_DEFAULT_GOV_SCHEDUTIL y
> > +CPU_FREQ_GOV_ATTR_SET y
> > +CPU_FREQ_GOV_SCHEDUTIL y
> > 
> > ...will report.
> > 
> 
> Not sure why I see here "powersave".
> Does Intel-PState driver not support CPU_FREQ_GOV_SCHEDUTIL?
> 
> $ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
> intel_pstate
> intel_pstate
> intel_pstate
> intel_pstate
> 
> $ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
> powersave
> powersave
> powersave
> powersave

If you are using Ubuntu, the OS has a script which will automatically
change from performance.
Doug can give more information on this script.

Thanks,
Srinivas



> 
> See also attached files.
> 
> - sed@ -