I asked for information at the #radeon channel, which turned up that it's a bug
of Xorg itself:
http://lists.freedesktop.org/archives/xorg/2008-September/038534.html
There was also said that Xserver 1.5.1 (or probably 1.5.2) will contain
a fix for that EXA problem. IMHO it'll be one of the more important
patches which'll have to be packed into Ibex, even if it will already
have been released by then.
Status of this bug updated to match most recent information.
** Changed in: xorg (Ubuntu)
Sourcepackagename: xserver-xorg-video-ati => xorg
Status: Confirmed => In Progress
** Description changed:
+ -- UPDATE --
+
+ This turned out to be a Xserver bug, which most likely will be patched in the
1.5.2 release of Xserver.
+ Upstream information:
http://lists.freedesktop.org/archives/xorg/2008-September/038534.html
+
+
+ -- OLD BUG REPORT --
+
Binary package hint: xserver-xorg-video-ati
Since the last batch of updates (where all the xorg video drivers got
updated), I'm experiencing lagspikes in my ubuntu environment. I've
traced this back to Xorg using up to 97% CPU on certain moments. This
only happens when I'm using the EXA acceleration method, instead of the
default XAA one.
With the default XAA, all works very smoothly. But now, with EXA
enabled, Xorg often spikes to 100% CPU, mainly when opening
applications, scrolling or opening textfiles, or spawning new GTK
widgets.
I'm using the EXA acceleration to be able to playback video when using
Compiz. I've also filed a bug to use EXA as default accelerator:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
ati/+bug/269357
The Xorg option I used to force EXA:
Option "AccelMethod" "EXA"
System details:
Xorg window system 1:7.4~2ubuntu1
RADEON display driver 1:6.9.0+git20080826.a3cc1d7a-2ubuntu2
Sapphire X1650 Pro
Ubuntu Intreprid, fully updated
--
Xorg eats CPU when using EXA
https://bugs.launchpad.net/bugs/269388
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