Exa and radeon

[Francesco Biscani]

> There are several rendering issues with Radeon EXA support.  I try to do
> EXA infrastructure against fakexa first so that I can trust the
> correctness, and then do performance testing on the Radeon.  Even with
> current CVS as of a few minutes ago, there's bug #6755 and bug #6756
> outstanding for radeon.
>
> I just fixed some migration issues, so hopefully performance will be
> better now.  I'm still crawling through fallback logs trying to track
> down further performance issues.  I also really need to spend more time
> on KDE -- my usual debug session is metacity, mozilla, gnome-terminals,
> and xcompmgr -c.
>
> The next patch I'm looking at for EXA is:
> https://bugs.freedesktop.org/show_bug.cgi?id=6772

Hi Eric,

just a quick update. I've tried some of the patches in those bugreport (but 
not that for shm pixmaps), but they did not make any difference for me. I've 
just compiled the latest ati-driver and xorg from CVS, and the pixmap 
corruptions in kwin remain.

Performance-wise, I think I've tracked down the situation in which there are 
serious issues: it is when xcompmgr is active _and_ text-scrolling happens. 
Like in a terminal window (konsole), or in a browser (konqueror). It may be 
related to the Qt toolkit, since with firefox the problem is much less 
evident. Performance problems really seems to be closely related to text 
rendering in my empirical tests.

Hope that helps.

  Francesco


-- 
Dr. Francesco Biscani
Dipartimento di Astronomia
Università di Padova
biscani at pd.astro.it