Slow 2D with radeon KMS
mailings.xorg at mirabel-sil.com
Fri Feb 12 05:58:01 PST 2010
Now with :
- xserver 1.7.4
- 2.6.33rc7 with KMS
- libdrm, mesa, xf86-video-ati from git
2D and 3D are back OK on an R700 (HD4650 mobility (M98))
However I see 2 performance issues :
- glxgears tops at 1450fps (compared to ~2500fps without KMS)
- GL vsync is broken, ie visual tearing especially at playing large videos
(XV or OGL) with Kwin compositing enabled
Any thoughts on this ?
> On Sat, 30 Jan 2010 15:35:44 +0100 (CET)
> "Damien Mir" <mailings.xorg at mirabel-sil.com> wrote:
>> I just tried KMS with "radeon" driver, and 2D seems notably slow.
>> Widgets takes time to draw, scrolling in Dolphin or Firefox lags, as
>> if some 2D acceleration was not working alright.
> I use radeon KMS on an R600 (HD 3870) and all works really well. 2D as
> well as 3D (glxgear, tuxracer, nexuiz). Kernel is 2.6.32 and
> drm, mesa, xf86-video-ati are latest git HEAD. Maybe you need a newer
> version of the ati driver.
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