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

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Date:	Wed, 30 Mar 2016 15:18:31 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	sedat.dilek@...il.com,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Doug Smythies <dsmythies@...us.net>,
	Jörg Otte <jrg.otte@...il.com>
Cc:	Linux PM List <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [intel-pstate driver regression] processor frequency very high
 even if in idle

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.

I would expect the same in Jorg's platform. But he has a haswell which
has a special feature called config TDP. So he is effectively running
in powersave mode, his platform may be forcing to lower TDP.

So Jorg, can you send the turbostate also with the above debug option.
Also

rdmsr 0xce
rdmsr 0x1ad
rdmsr 0x648
rdmsr 0x649
rdmsr 0x64A
rdmsr 0x64b
rdmsr 0x64c

Thanks,
Srinivas