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

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Date:	Thu, 31 Mar 2016 12:58:44 +0530
From:	"Navin P.S" <navinp1912@...il.com>
To:	"Rafael J. Wysocki" <rafael@...nel.org>, 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>,
	"jrg.otte@...il.com" <jrg.otte@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"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, 5:12 AM Rafael J. Wysocki <rafael@...nel.org> wrote:
>>
>> 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,
>> >>>>> > > >
>> >>>>> > > > (snipped)
>>
>> 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?

Resend.


 https://bugzilla.kernel.org/show_bug.cgi?id=114741

I was looking through ubsan and found this relevant.Hp envy runs on
x64 but the bug seems to mention (ia64).

 I see two versions rdmsrl and rdmsrl_safe.
These values are filled by rdmsrl .Does changing to safe function help .

 Can an exception ever happen in case of  MSR_IA32_APERF ?

Those values certainly cannot be negative and so huge.