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

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Message-ID: <1459532674.13525.136.camel@linux.intel.com>
Date:	Fri, 01 Apr 2016 10:44:34 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	Jörg Otte <jrg.otte@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	"Rafael J. Wysocki" <rafael@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Doug Smythies <dsmythies@...us.net>
Subject: Re: [intel-pstate driver regression] processor frequency very high
 even if in idle

On Fri, 2016-04-01 at 16:06 +0200, Jörg Otte wrote:
> 2016-04-01 14:40 GMT+02:00 Rafael J. Wysocki <rjw@...ysocki.net>:
> > 
> > On Friday, April 01, 2016 11:20:42 AM Jörg Otte wrote:
> > > 
> > > 2016-03-31 17:43 GMT+02:00 Rafael J. Wysocki <rjw@...ysocki.net>:
> > > > 
> > > > On Thursday, March 31, 2016 05:25:18 PM Jörg Otte wrote:
> > > > > 
> > > > > 2016-03-31 13:42 GMT+02:00 Rafael J. Wysocki <rjw@...ysocki.n
> > > > > et>:
> > > > > > 
> > > > > > On Thursday, March 31, 2016 11:05:56 AM Jörg Otte wrote:
> > > > > > 
[Cut]
> > > > > > 
> Done. Attached the tracer.
> For me it looks like the previous one of the failing case.
> 
The traces show that idle task is constantly running without sleep. The
driver is processing samples for idle task for every 10ms and
aperf/mperf are showing that we are always in turbo mode for idle task.

Need to find out why idle task is not sleeping.

Thanks,
Srinivas



> Thanks, Jörg