[Intel-gfx] Increased latency from removal of GEM_THROTTLE in 2D driver
pcjc2 at cam.ac.uk
Fri Nov 5 18:44:59 PDT 2010
I've been playing with my app again, and whilst it seems a tiny bit
faster in benchmarks, since the 2D driver change:
Author: Eric Anholt <eric at 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
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