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

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Date:	Thu, 31 Mar 2016 01:28:59 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	sedat.dilek@...il.com
Cc:	"Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"dsmythies@...us.net" <dsmythies@...us.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jrg.otte@...il.com" <jrg.otte@...il.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"rafael@...nel.org" <rafael@...nel.org>
Subject: Re: [intel-pstate driver regression] processor frequency very high
 even if in idle

On Thu, Mar 31, 2016 at 1:25 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Thu, Mar 31, 2016 at 1:17 AM, Pandruvada, Srinivas
> <srinivas.pandruvada@...el.com> wrote:
>> On Wed, 2016-03-30 at 15:46 -0700, Srinivas Pandruvada wrote:
>>> 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?
>>> >

[cut]

>
> Too much questions.

OK

> I switched to CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE=y and tested with
> the simplified revert-patch of Rafael.

Why do you need the revert patch in the first place?