On Tue, 5 Oct 2004 19:04:02 -0300
"Paulo R. Dallan" <[EMAIL PROTECTED]> wrote:
[snip]
> At first impression, 3d acceleration seemed really bad (????). Glxgears was
> giving me 130, 140 FPS! And this is an Athlon XP 2600 with the ATI 9200se (I
> know, this video card is not that good, but results should not be so bad, it
> has 128 Mb, AGP 8x (though dri is only up to 4X), 64 bits)...
>
> Any tip of what could be wrong?
>
> PS: Changed XOrg.conf to set 16 bits as the default depth and included '
> Option "AGPMode" "4" '. Got a better performance: 400 FPS. Should I also try
> ' Option "AGPFastWrite" "boolean" ' (in this case, in place of boolean
> 'true', '1', 'yes')?
>
> Anyway, are these 400 FPS what I should be expecting as performance, or is it
> still considered low (the PIII500 with a Savage4 32Mb at AGP 2X gets 200-250
> FPS)?
There may be a problem with the new glxgears from X.org. When I run it
alone I get the full framerate I can expect (~385 fps on ProSavage DDR).
When I run a CPU hog at the same time ("while true; do true; done" in
bash) The frame rate goes down to 10 fps and glxgears gets only 1% of
the CPU. With the old glxgears from XFree86 the frame rate reduces to
about 195 and the CPU is shared about 50:50 between glxgears and the
CPU-hogging bash.
In order to draw any meaningful conclusions from the CPU usage with r200
you need to change frame throttling to busy waiting. You can do that
using driconf or on the command line with
fthrottle_mode=0 glxgears
Run top on a different terminal and see how much CPU is used by
glxgears. It should be close to 100%. If significant CPU power is used
by a different process that would explain the low FPS. If the CPU is
idle then there might be something wrong with process scheduling in the
kernel.
HTH,
Felix
| Felix Kühling <[EMAIL PROTECTED]> http://fxk.de.vu |
| PGP Fingerprint: 6A3C 9566 5B30 DDED 73C3 B152 151C 5CC1 D888 E595 |
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