[ltp] New Xorg ATI video drivers sloooow (in Fedora 10)

[Matthias Runge]

Michael Karcher wrote:
> Am Montag, den 05.01.2009, 13:04 +0100 schrieb Matthias Runge:
>> I've used fedora 9 also, so I just did an upgrade (and did not touch my
>> xorg.conf). In Fedora 9 the "ultimate benchmark" glxgears gave me approx
>>  800-900 frames per second, Fedora 10 just comes to 50 frames. (Machine
>> is a T43, ATI graphics, 1400x1050 screen)
> AFAIK the 1400x1050 LCD runs at 50Hz refresh rate. Probably
> wait-for-vsync is now default; you can change that with driconf. Easiest
> way of telling whether the acceleration fails or wait-for-vsync is the
> culprit: Look at your CPU usage. If it is high, something is fishy with
> your 3D setup. If it is low (<10%) while glxgears is running, glxgears
> just avoids calculating frames that would never be shown anyway.
> 
> Regards,
>   Michael Karcher
That's an interesting thought. I'll check that. My dri.conf is pretty
empty. If I remember right, cpu usage is comparably low, but I'll check
that, too.

Something else: colors in glxgears seem to be darker (e.g. not a pure
red but a faded red (as if some color is missing)). It may be related
with the refresh and points to wait-for-sync (or something like that).

Matthias