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

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Message-ID: <56FC5277.9050906@intel.com>
Date:	Thu, 31 Mar 2016 00:25:59 +0200
From:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.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 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?

So there seems to be a problem here AFAICS.