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

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Date:	Wed, 30 Mar 2016 15:46:43 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc:	sedat.dilek@...il.com, Doug Smythies <dsmythies@...us.net>,
	Jörg Otte <jrg.otte@...il.com>,
	Linux PM List <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [intel-pstate driver regression] processor frequency very high
 even if in idle

On Thu, 2016-03-31 at 00:25 +0200, Rafael J. Wysocki wrote:
> On 3/31/2016 12:18 AM, Srinivas Pandruvada wrote:
> > 
> > On Wed, 2016-03-30 at 23:41 +0200, Sedat Dilek wrote:
> > > 
> > > Hi,
> > > 
> > > I am using Intel-PState-Driver here with v4.6-rc1 and Intel-
> > > SandyBridge-CPU.
> > > 
> > > Here are my turbostat results attached.
> > > 
> > > $ cd $BUILD_DIR
> > > $ LC_ALL=C make -C tools/ turbostat
> > > 
> > > $ sudo ./turbostat -i 1 --msr=0x199 --debug --out
> > > /tmp/turbostat-i-1-msr-0x199-debug.txt
> > > 
> > > Will try <https://patchwork.kernel.org/patch/8702071/>.
> > > 
> > > Please see attached files.
> > > 
> > Thanks. Your logs make sense. You have config set to performance
> > mode
> > by default (Which I believe default in all kernel Ubuntu). So as
> > expected Intel P state was asking for max. So there is no issue
> > here.
> But the behavior is different from what it used to be, isn't it?
> 
There are two turbostat output files, In both I see we are requesting
max (0x1700) in performance mode. This CPU is Sandybridge, so no config
TDP here, the other problem system reported is Haswell
.
 0       1       3    0.15    2017    1596  0x00001700 

I am not sure whether Sedat is saying that he has the same issue as
Jorg. I think Sedat will see the same turbostat output if he ran 4.5.

Sedat, 
Please confirm whether you see difference between 4.5 and 4.6-rc1.

Thanks,
Srinivas

> So there seems to be a problem here AFAICS.
> 
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