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xorg.conf performance


KDE - Jun 10 2010
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Question:What is the best xorg.conf configuration with the binary nvidia driver to get maximum performance in KDE 4

Thanks for all the tips.




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Frank Karlitschek 33

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Answer:

I don't exactly nvidia problems and how it's driver work on linux, but I'm pretty sure your distro has hal and udev well working, you don't need a xorg.conf at all! So you can start from there: if it works, then you can type, as root: X -configure and a fresh xorg.conf will be created on root home folder! In this conf all your basialr settings have to be recognize.. then edit it as you prefer as you want to add something specific..

Hoping this answer helps you, bye!!



(THAT WAS THE PREVIOUS ANSWER:

Hello.
I'm astonished to see that your question isn't flooded with answers because it depends on to much variables, or maybe thats the reason. If you "google" for your question and check the links for older x.org versions, you will find lots of links and the majority of which won't help you much. Sorry because this isn't really an answer but I have searched allot myself. Bye.

))




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 not so much about xorg.conf ..

 
 by thomas12777 on: Oct 29 2010
 
Score 50%

the defaults should more or less be sufficient. be careful with adjusting esp. "PixmapCacheSize" or activating the "BackingStore"

There're two major problems with nvidia GPUs:

a) Allocation of ARGB (32bit / translucent) pixmaps*

The driver knows several strategies to do this. The "-a InitialPixmapPlacement=n" hint is however pretty long time known and rencent driver usually have the best available strategy set (actually from my experience "0" is fastest, but it causes problems with the indirect decoration rendering...) - in doubt you can try, but be aware that some values might be so slow that you'll have fun setting them back ;-)

WHAT IS MORE IMPORTANT:
something in kdelibs (unrelated to compositing) seems to flood the drivers PixmapCache.
You can reset it with "nvidia-settings -a PixmapCache=0; nvidia-settings -a PixmapCache=1" but it gets respammed over the time (thus the access become slower) so it's a good idea to cron this (but it causes a momentary (some ms) GUI freeze when it happens)

* there's a "benchmark" for this attached at https://bugs.kde.org/show_bug.cgi?id=234463

b) Tearing...
OpenGL syncing currently doesn't work out of the box with nvidia chips since the driver doesn't report a usefull refresh rate via xrandr.
You can read the refreshrate from nvidia-settings and hardcode it. then restart kwin afterwards to (hopefully...) workaround this problem.

kwriteconfig --file kwinrc --group Compositing --key RefreshRate `nvidia-settings -q RefreshRate | grep Attribute | sed -e 's/.*: \([0-9]\{1,\}\),.* Hz.*/\1/'` && kwin --replace &

also be aware that (afaik) vsync can ONLY work with direct rendering enabled


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