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From: "Nicolas Kalkhof" <nkalkhof@web.de>
To: Andrew Lutomirski <luto@mit.edu>, Keith Packard <keithp@keithp.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
	intel-gfx@lists.freedesktop.org,
	Eugeni Dodonov <eugeni.dodonov@intel.com>
Subject: Re: [PATCH 1/2] drm/i915: re-enable semaphores by default
Date: Wed, 16 Nov 2011 21:56:37 +0100 (CET)	[thread overview]
Message-ID: <880599371.4875447.1321476997747.JavaMail.fmail@mwmweb002> (raw)

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@mit.edu>
Gesendet: Nov 16, 2011 6:24:54 PM
An: "Keith Packard" <keithp@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@keithp.com> wrote:
>> On Wed, 16 Nov 2011 16:49:40 +0100, Daniel Vetter <daniel.vetter@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
>_______________________________________________
>Intel-gfx mailing list
>Intel-gfx@lists.freedesktop.org
>http://lists.freedesktop.org/mailman/listinfo/intel-gfx


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             reply	other threads:[~2011-11-16 20:56 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-16 20:56 Nicolas Kalkhof [this message]
2011-11-16 21:14 ` [PATCH 1/2] drm/i915: re-enable semaphores by default Daniel Vetter
2011-11-16 22:15 ` Keith Packard
  -- strict thread matches above, loose matches on Subject: below --
2011-11-18 18:36 Nicolas Kalkhof
2011-11-17 18:31 Nicolas Kalkhof
2011-11-18 15:26 ` Daniel Vetter
2011-11-17  8:57 Nicolas Kalkhof
2011-11-17  9:22 ` Daniel Vetter
2011-11-22  5:41   ` Andrew Lutomirski
2011-11-22 11:23     ` Daniel Vetter
2011-11-29 16:39     ` Daniel Vetter
2011-11-14 20:39 Eugeni Dodonov
2011-11-14 21:23 ` Jesse Barnes
2011-11-16 15:49 ` Daniel Vetter
2011-11-16 17:16   ` Keith Packard
2011-11-16 17:24     ` Andrew Lutomirski
2011-11-16 19:05       ` Eugeni Dodonov
2011-11-16 19:23         ` Jesse Barnes
2011-11-16 20:18     ` Daniel Vetter
2011-11-16 21:37       ` Keith Packard

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