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List:       mesa3d-dev
Subject:    Re: [Mesa3d-dev] intel issue with gears port using vertex buffer
From:       Eric Anholt <eric () anholt ! net>
Date:       2009-04-28 7:47:23
Message-ID: 1240904843.13997.37.camel () gaiman ! anholt ! net
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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
eric@anholt.net                         eric.anholt@intel.com



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