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

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Message-ID: <CAJZ5v0iFgWFs+pMCJQgeiTH=zTg1pfSUa4gPGX7q2jB40dcUHA@mail.gmail.com>
Date:	Fri, 1 Apr 2016 22:24:00 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:	Jörg Otte <jrg.otte@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	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, Apr 1, 2016 at 5:05 PM, Srinivas Pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
> On Fri, 2016-04-01 at 11:42 +0200, Jörg Otte wrote:
>> 2016-03-31 19:55 GMT+02:00 Srinivas Pandruvada
>> <srinivas.pandruvada@...ux.intel.com>:
>> > On Thu, 2016-03-31 at 19:27 +0200, 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]
>
>> I compile a minimum kernel for my notebook. The hardware is fix and
>> will never change. So I don't need thousends of modules to compile.
>> Kbuild supports this with target "localmodconfig".
>> In the rare cases where I get new usb-hardware I add a new driver
>> and compile a new kernel which takes only a minute.
>>
> With this minimum config, I am not able to properly run my laptop to
> reproduce.
> May be something odd in this config is triggering this issue, we are
> not going to idle on some CPUs.

You can use ./scripts/diffconfig (in the kernel source tree) to find
differences between your working config and the Jörg's one and try to
flip the bits that may matter in your config.