[Bug 21683] EXA on radeon chip seems to trigger serious performance issues

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=21683





--- Comment #20 from timo.jyrinki at hut.fi  2009-05-24 00:29:19 PST ---
(In reply to comment #13)
> Created an attachment (id=25890)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=25890) [details]
> use XAA in low memory situations or when the DRI is disabled

I don't think 32MB is too little. At least I think the ideal solution would be
to set FBTexPercent to 0 with let's say less than 64MB. I set it with my
Mobility 9000 (32MB) and EXA seems pretty fast for me (opposed to what is was
before setting FBTexPercent).

So if you know how to check it / do it, I'd propose FBTexPercent 0 for <65535
and XAA for <32768 (not <=).

I additionally tested setting DepthBits to 16 which halves the memory usage for
that buffer, but didn't notice any specific improvement in this case besides
Xorg.0.log stating more memory could be used for EXA. It does generate issues
in some 3D stuff but eg. compiz works fine.


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