On Mon, 2009-04-27 at 09:55 -0600, Brian Paul wrote: > Brian Paul wrote: > > Ian Romanick wrote: > >> -----BEGIN PGP SIGNED MESSAGE----- > >> Hash: SHA1 > >> > >> Michael Clark wrote: > >> > >>> I did a git bisect and found the revision where I see the biggest > >>> drop in performance (roughly 30% drop with my app): > >>> > >>> $ git bisect bad > >>> Bisecting: 0 revisions left to test after this > >>> [20f3497e4b6756e330f7b3f54e8acaa1d6c92052] i965: re-org of some of > >>> the new constant buffer code > >>> > >>> I think there may be some other performance regressions in there as > >>> the commit before this is also not as fast as mesa_7_4_branch > >>> although the above commit has the most noticeable drop. > >>> > >>> I think gears is the same speed before and after the commit so I'm > >>> not yet sure what part if my app is exercising the code that has the > >>> performance drop. I'll try to work up a small test program if I get > >>> time. > >> > >> I've been experiencing this with some of our internal test cases. The > >> killer seems to be programs that do lots of state changes. glxgears > >> does almost no state changes, so it's not surprising that it doesn't > >> take a big hit. > > > > That's one of my commits. I'll take a look... > > OK, I've just pushed a commit which should restore performance back to > what it was.
Thanks for fixing it -- OA is now up to 80% of mesa 7.4's performance, instead of 25%. -- Eric Anholt e...@anholt.net eric.anh...@intel.com
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