Recent poor DVD playback performance

[Philip Walden]

Andy Green wrote:

> Philip Walden wrote:
>
>> Top says Xorg0 @ 68%, mplayer @ 28%.
>
>
> Might it be the offscreen compositing stuff somehow?  If there is 
> something like this floating around in /etc/X11/xorg.conf
>
> Section "Extensions"
>         Option      "Composite" "Enable"
> EndSection
>
> try setting it to Disable and restart X.

Looks like it is a xorg bug such that it does not set MTRR reducing AGP
performance by 2X:
https://bugs.freedesktop.org/show_bug.cgi?id=6221
https://bugs.freedesktop.org/show_bug.cgi?id=5801
Explains why I am seeing this recently too as xorg 7.0 was installed 
late August. Fixed in xorg 7.1

I submitted a bug to redhat
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=217446

After manually setting /proc/mtrr, xorg cpu usage has dropped from 70% 
to 20%.