[Intel-gfx] [PATCH] drm/i915: Use PM QoS to prevent C-state memory starvation of the GPU

[Andrew Lutomirski]

On Wed, Dec 8, 2010 at 12:00 PM, Vasily Khoruzhick <anarsoul at gmail.com> wrote:
> On Wednesday 08 December 2010 18:54:21 Chris Wilson wrote:
>> On Wed, 8 Dec 2010 18:44:41 +0200, Vasily Khoruzhick <anarsoul at gmail.com>
> wrote:
>> > On Wednesday 08 December 2010 18:24:35 Chris Wilson wrote:
>> > > This is just a preliminary attempt to see if this even helps. Obviously
>> > > some more effort will need to be spent investigating a better choice of
>> > > latency and when we need to request it, but first: does this help?
>> >
>> > Sorry, but it does not. glxgears is still jerky.

Do you have the 2.6.36.2 candidate patch that fixes pm_qos in?  From
the description, it looks like pm_qos doesn't work at all without it.

--Andy

>>
>> I thought we were trying to fix the reported framerate?
>
> Yep, it reports 20-30 instead of 60
>
>> Try adjusting the
>> request max latency down from 20 to 1, or even 0.
>
> Will try.
>
> Regards
> Vasily
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