[Bug 34156] r600g performance regression between 780c183b and 862ebb41

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Apr 11 20:15:22 PDT 2011


--- Comment #9 from Dave Witbrodt <dawitbro at sbcglobal.net> 2011-04-11 20:15:22 PDT ---
I have been away from Linux and testing radeon support since the Japan crisis
began.  Updating to Mesa 7.11.0-devel, commit a26121f3, caused the same
slowdown I had observed before:  min/max framerate in 'torcs' dropped from
28/54 fps to 17/34 fps.  I was planning on restoring local packages of my last
fast-working Mesa, but decided to rebuild my entire X stack against my newly
updated kernel (updated from 2.6.38-rc8 to

To my shock, I found that replacing xorg-server with and
updating the radeon driver to the latest git version, 6.14.99-devel, commit
cc7d1fa3 -- both built against the Mesa mentioned above -- improved Mesa
performance in 'torcs' dramatically.  It is no longer as consistently high as I
was getting, but gives me 17/54 fps.

I also notice that another test program, 'prboom-plus', has dramatically
improved performance all around.  As a result, I am abandoning my local git
branch where I intended to pin down the exact cause of the performance changes
-- I haven't touch it for 7 weeks anyway -- and start following the Mesa HEAD

Sorry for the false alarm.  It appears that Mesa changes alone were not to
blame for whatever performance problems I was experiencing.

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