Bug#538810: video-radeon: direct rendering: graphics deceleration?

[Michal Suchanek <hramrach@centrum.cz>]

2009/7/30 Michel Dänzer <daenzer@debian.org>:
> On Thu, 2009-07-30 at 01:36 +0200, Michal Suchanek wrote:
>>
>> The majority of time is spent in:
>> (with -fps) 181333   53.6798  radeon.ko                radeon.ko
>>          radeon_do_wait_for_idle
>> (without -fps) 287349   59.3526  radeon.ko                radeon.ko
>>             radeon_freelist_get
>
> This indicates the GPU is the bottleneck, but I'm not sure why it would
> be that slow... though one thing I notice now is that the card only has
> a 64 bit wide memory bus, that could be the bottleneck. What kind of
> numbers does
>
> x11perf -copywinwin500 -aa10text -repeat 1
>
> give? (Preferably without a compositing manager running)
>

This is the output:

x11perf - X11 performance program, version 1.2
The X.Org Foundation server version 10602901 on :0.0
from heretic
Fri Jul 31 00:06:24 2009

Sync time adjustment is 0.1073 msecs.

3200000 reps @   0.0018 msec (554000.0/sec): Char in 80-char aa line
(Charter 10)

   8000 reps @   0.6963 msec (  1440.0/sec): Copy 500x500 from window to window

The next thing to try might be to install the drm modules that came
with the mesa library. I would expect that like CPU operations the GPU
operations can be optimized so a later code could have better results.
 Unfortunately. unlike Intel ATI did not hand out optimization manuals
for their chips so there is not much hope in improving the
performance.

Thanks

Michal