Bug#583653: xserver-xorg-video-radeon: 15x-slower performance regression in KMS mode for 2D operations

[Michel Dänzer <daenzer@debian.org>]

On Sam, 2010-05-29 at 10:21 +0200, Sylvain Beucler wrote: 
> 
> When using the R300 driver in KMS mode (current default), performances
> for 2D operations are 15x slower than without KMS mode (previous
> default).
> 
> The attached simple test runs at 17FPS in KMS mode on my computer,
> against 300FPS in non-KMS mode.

On a similar setup (RV350 in a PowerBook) here, it runs at about 60-70
fps with compiz and just above 100 fps without compositing.

BTW, are your UMS numbers from driver version 6.13? With EXA or XAA?


> This makes most 2D games unplayable.

I'm not sure the test app is really representative for 'most 2D games'.


-- 
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer