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

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Date:	Thu, 31 Mar 2016 01:41:22 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	sedat.dilek@...il.com
Cc:	"Rafael J. Wysocki" <rafael@...nel.org>,
	"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>
Subject: Re: [intel-pstate driver regression] processor frequency very high
 even if in idle

On Thu, Mar 31, 2016 at 1:32 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Thu, Mar 31, 2016 at 1:28 AM, Rafael J. Wysocki <rafael@...nel.org> wrote:
>> 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?
>
> I simply wanted to test CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE=y and
> keep the rest.

But it is not clear to us whether or not your system has regressed
with respect to 4.5, which is the whole point of this thread.  Do you
see a regression here?

Jörg in particular is saying that he sees the problem with both
performance and powersave settings.  What about you?