Bug#667721: xserver-xorg-video-radeon: abysmal performance

[Michel Dänzer]

On Fre, 2012-04-06 at 10:41 +0200, martin f krafft wrote: 
> Package: xserver-xorg-video-radeon
> Version: 1:6.14.4-1
> Severity: important
> 
> I do not know precisely when this started, but it must have been
> during March or early April.
> 
> First I noticed that my CPU fan was always running at maximum speed.
> Looking at top, I found that Xorg consistently used between 20% and
> 50% of my CPU time. Running Iceweasel made things worse.
> 
> I then followed advice on #debian-x and tried sysprof (see
> attached).

Thanks, but unfortunately the sysprof callgraphs are pretty much useless
on 64 bit.

That said, your mention of iceweasel reminds me of
https://bugs.freedesktop.org/show_bug.cgi?id=47266 , which apart from
the visual corruption also involves degraded performance due to many
more software rendering fallbacks.

If downgrading libcairo2 to 1.10.2 works around the problem, that's
probably the best workaround for now until we get a better handle on the
above. Otherwise, Option "NoAccel" might be feasible if you don't need
OpenGL or XVideo acceleration.


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer