ati driver with KMS under debian sid : 15x slower and questions

giggz giggzounet at
Sun May 30 05:58:18 PDT 2010

giggz a écrit :
> Hi,
> I'm running under debian sid up to date. But with a 2.6.34 compiled with
> KMS support.
> with xserver-xorg-video-ati version 1:6.13.0-2 glxgears gives : 166.882 FPS
> with 6.12.6-1 I got around 2400 FPS.
> So it really slow now. When a programm takes CPU, I can't do anything
> under X (I have e17). Is it a regression from the driver or is the
> transition not achieved ? How can I modify my xorg.conf in order to get
> more FPS ?
> Others questions :
> - I have seen in the changelog that exa is now enabled by default. But
> when I start X XAA is used. I have to write 	
> Option		"AccelMethod"	"EXA"
> in order to get EXA (when I enable EXA it doesn't change anything for
> the FPS.)
> - I'm using radeonfb with the grub line :
> video=radeonfb:ywrap,mtrr,1400x1050
> could this line have an influence on the ati xorg driver performances ?
> Thx a lot,
> Best regards,
> Guillaume

Some details :

When I modify radeon-kms.conf with modeset=0 I get 2000 FPS with
glxgears. And EXA is automaticly used.
with modeset=0 it's XAA.

I can provide xorg.copnf or xorg.log if this issue is unknown.


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