It looks like Michal was correct in comment #7. One thing that might
improve the performance of the open-source radeon drivers slightly in
the latest upstream 3.0.18 kernel is this patch:
commit a674b8b3e345496a96aec389446650455b2fdfa1
Author: Alex Deucher
Date: Tue Jan 3 09:48:38 2012 -0500
drm/radeon/kms: disable writeback on pre-R300 asics
commit 28eebb703e28bc455ba704adb1026f76649b768c upstream.
We often end up missing fences on older asics with
writeback enabled which leads to delays in the userspace
accel code, so just disable it by default on those asics.
Reported-by: Helge Deller
Reported-by: Dave Airlie
Signed-off-by: Alex Deucher
Signed-off-by: Dave Airlie
Signed-off-by: Greg Kroah-Hartman
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https://bugs.launchpad.net/bugs/852554
Title:
Poor video playback performance with radeon driver and compositing
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