[Intel-gfx] [PATCH] drm/i915: protect force_wake_(get|put) with the gt_lock

Nicolas Kalkhof nkalkhof at web.de
Wed Nov 9 17:22:00 CET 2011


Daniel,

Bisecting the kernel proved a little time consuming ;) however with the very latest linux.git anf xf86-video-intel the cpu load doesn't seem to go up accodring to top. What I can see is that the SNB draws approx 10-15 watts more when my system is completely idle. My first thought was that rc6 is being disabled but i915_enable_rc6 reports 1. Is there a way I can monitor the gpu frequency or its current power state?

Nic

-----Urspr√ľngliche Nachricht-----
Von: "Daniel Vetter" <daniel at ffwll.ch>
Gesendet: Nov 7, 2011 7:36:28 PM
An: "Nicolas Kalkhof" <nkalkhof at web.de>
Betreff: Re: [Intel-gfx] [PATCH] drm/i915: protect force_wake_(get|put) with the gt_lock

>On Mon, Nov 07, 2011 at 07:14:35PM +0100, Nicolas Kalkhof wrote:
>> ok here is the sysprof result (see below). No cpu/gpu intensive apps are
>> running, just the idling desktop. CPU Temperature is low and frequency
>> is throttled down to 800 MHz like it should be. The System is responsive
>> and behaves normal but top shows full cpu load. Honestly I cannot see
>> the reason why X and gkrellm should eat up all the gpu since they
>> clearly don't hog the cpu. Maybe the kernel reports wrong cpu stats?
>> Then again the load goes down when I kill X! Hope this gives you a clue.
>
>On a quick look it seems that at least X is busy-spinning in the select
>loop and gkrellm seems to be eqally busy doing not much. Have you tried
>what happens when you kill gkrellm?
>
>Otherwise I think it's time for a bit of bisecting.
>-Daniel
>--
>Daniel Vetter
>Mail: daniel at ffwll.ch
>Mobile: +41 (0)79 365 57 48


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