From: Eric Anholt <eric@anholt.net>
To: Peter Clifton <pcjc2@cam.ac.uk>,
"intel-gfx@lists.freedesktop.org"
<intel-gfx@lists.freedesktop.org>
Subject: Re: Increased latency from removal of GEM_THROTTLE in 2D driver
Date: Sun, 07 Nov 2010 23:37:50 -0800 [thread overview]
Message-ID: <87fwvce04x.fsf@pollan.anholt.net> (raw)
In-Reply-To: <1289007899.8333.4.camel@pcjc2lap>
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On Sat, 06 Nov 2010 01:44:59 +0000, Peter Clifton <pcjc2@cam.ac.uk> wrote:
> I've been playing with my app again, and whilst it seems a tiny bit
> faster in benchmarks, since the 2D driver change:
>
> commit 8ff37667bf864b771d16a58fc5041cb48408b6a8
> Author: Eric Anholt <eric@anholt.net>
> Date: Tue Nov 2 10:36:03 2010 -0700
>
> Remove the intermittent GEM_THROTTLE call.
>
>
> I've noticed the latency / interactivity is WAY down, and I've also had
> intermittent GPU hangs whilst benchmarking which I'd never seen before.
>
> It might be unrelated (as I'm running a back-ported drm-intel-next, and
> just pulled it up to date), but for a quick check, I just reverted to a
> previous 2D driver just prior to the above commit, and interactivity has
> improved a lot (I don't have a number for it, just from testing).
>
> Presumably this says something bad about my app, or its benchmarking
> code. Any clues as to what that is?
>
> Without the commit, I can use other X11 apps whilst my PCB program is
> benchmarking. With it, the X11 server graphics almost completely freeze
> up.
I'm seeing this too, with vblank_mode=0 and various apps. Something
appears to be broken with the swapbuffers waits in the GL driver,
perhaps.
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prev parent reply other threads:[~2010-11-08 7:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-06 1:44 Increased latency from removal of GEM_THROTTLE in 2D driver Peter Clifton
2010-11-06 9:14 ` Chris Wilson
2010-11-08 7:37 ` Eric Anholt [this message]
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