[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 #19 from Michel Dänzer <michel at daenzer.net>  2009-05-23 03:56:01 PST ---
(In reply to comment #18)
> I think i'm experiencing the same issue with my 4850 (rv770).

No, this report is about a performance regression from XAA to EXA on some
setups, whereas XAA has never been supported for your card.


> But radeonhd doesn't have performance issues. I can switch the driver, simply
> restart X and get perfect performance, therefore i do think it is a radeon
> issue.

Does radeonhd use EXA as well, with the same set of acceleration primitives and
a similar amount of EXA offscreen memory?


> Another funny thing is that switching to another virtual desktop (KDE) fixes
> the performance, until i switch to the crowded desktop again.

Sounds like maybe you're suffering from EXA offscreen memory fragmentation.
This has been fixed in xserver Git, the fix will be in the 1.7 release.


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