[Intel-gfx] [PATCH 1/2] drm/i915: re-enable semaphores by default

[Nicolas Kalkhof]

Not quite. On my i7 2620M (Lenovo T420) the gpu frequently hangs when decoding videos (vaapi) and running OpenGL apps/games at the same time. Disabling iommu makes my system relatively stable even with rc6 enabled. I haven't played with the semaphores however.

-- Nic


-----Ursprüngliche Nachricht-----
Von: "Andrew Lutomirski" <luto at mit.edu>
Gesendet: Nov 16, 2011 6:24:54 PM
An: "Keith Packard" <keithp at keithp.com>
Betreff: Re: [Intel-gfx] [PATCH 1/2] drm/i915: re-enable semaphores by default

>On Wed, Nov 16, 2011 at 9:16 AM, Keith Packard <keithp at keithp.com> wrote:
>> On Wed, 16 Nov 2011 16:49:40 +0100, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
>>
>>> So we need to check whether DMAR is enabled (on the
>>> entire system, i.e. the variable exported for the ilk workaround is
>>> not good enough)
>>
>> Can you figure out what *would* be sufficient? Getting semaphores turned
>> on for the 99% who aren't enabling VT-d would be a fairly nice
>> performance improvement.
>
>AFAICT my snb laptop has always been stable with semaphores and VT-d
>enabled. Is this problem possibly restricted to just desktop
>machines? I'm happy to test, since my box that can reproduce the hang
>instantly is still around.
>
>Also, rc6-by-default would be very nice. It decreases the total power
>consumption on my laptop from over 13W to around 8W. That's huge.
>
>--Andy
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>Intel-gfx mailing list
>Intel-gfx at lists.freedesktop.org
>http://lists.freedesktop.org/mailman/listinfo/intel-gfx


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