Public bug reported:
Ubuntu 7.04 using kubunut desktop, NO DESKTOP EFFECTS enable whatsoever,
nvidia driver. (tried with stock ubuntu repo one, and latest 100.14 version via
envy with same exact results.
If the COMPOSITE extension is enabled in the /etc/X11/xorg.conf gtk-1.2
apps that are graphics intensive (I use my app, eXtace (in the repos) as
it does extensive 2D calls) causes Xorg to use about 40x more CPU and
perform sluggishly compared to when composite is disabled in the
/etc/xorg.conf.
thus. If composite is disabled as below:
Section "Extensions"
Option "Composite" "Disable"
EndSection
apps like eXtace will run liquid smooth, with minimal cpu usage (i.e.
under 1-2% at 85 FPS on a 2.1 Ghz athlon.
If I enable composite via:
Section "Extensions"
Option "Composite" "Enable"
EndSection
The the same exact app, eXtace will only run at 35fps consuming a steady
40% of the Xorg process only (NOT the eXtace process) Trying to
increase frame rate severely harms gui responsiveness, and will max out
CPU to 100% before even max framerate is achieved.
It seems that the composite extension is causing a rather serious performance
bottleneck, though at this time is seems to be limited soemwhat to GTK-1.2
based apps that are 2D intensive. I'm unsure if the composite extension is
causing any performance degradation to other 2D applications without further
testing.
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
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Xorg with composite enabled causes abnormally high cpu usage
https://bugs.launchpad.net/bugs/132268
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