Slow 2D with radeon KMS

[Alex Deucher]

On Fri, Feb 12, 2010 at 8:58 AM, Damien Mir
<mailings.xorg at mirabel-sil.com> wrote:
> 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

GL vsync got broken with the DRI2 swap buffers merge:
http://bugs.freedesktop.org/show_bug.cgi?id=26240

Alex

>
> Any thoughts on this ?
>
>
>> On Sat, 30 Jan 2010 15:35:44 +0100 (CET)
>> "Damien Mir" <mailings.xorg at mirabel-sil.com> wrote:
>>
>>> Hi,
>>>
>>> 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.
>>
>> harry
>>
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