[Bug 21611] 2c8e130f73c680d4a7381b2ef37982b82c6ee478 can cause massive 2D performance slowdown

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed May 6 23:47:05 PDT 2009


--- Comment #2 from Michel Dänzer <michel at daenzer.net>  2009-05-06 23:47:04 PST ---
First of all, there's no such thing as UXA in this driver... I assume when you
tried that it just fell back to the default EXA.

I don't think any kind of modern application uses PutImage XY operations, so
that benchmark probably isn't representative of your problem. What kind of
actual applications / operations are slow? Does using a compositing manager
help, even just xcompmgr -a?

Looking at the logs I suspect the main problem is that the EXA offscreen memory
area is small. Do you really need such a large max desktop size?

(I also notice that video RAM seems to be reserved for the GART table and
textures when the DRI is disabled, even though they aren't needed in that case.
We should fix this, but in general performance is expected to be better with
DRI enabled)

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