Re: PCI Vs AGP [was: Intel Graphics Media Accelerator 950]

"Peter D." <psd@xxxxxxxxxxxxxxxxx> writes:
Anton Ertl wrote:

"Peter D." <psd@xxxxxxxxxxxxxxxxx> writes:
My Radeon 9250 is only giving 460 FPS. Is that because it is a
PCI card, rather than an AGP?
....
OpenGL renderer string: Mesa DRI R200 20060327 x86/MMX+/3DNow!+/SSE2 TCL
OpenGL version string: 1.3 Mesa 6.5

Mesa DRI R200 is in there.

Another reason could be that you are running glxgears at more than the
default size.

460 FPS without me deliberately changing the size, I guess that
it is possible that there is some size configuration going on
that I can not see.

Not with the glxgears versions that I have seen. They all default
to some small (128x128?) window.

Maybe it is really the difference between AGP and PCI; the bandwidth
of PCI should be sufficient for glxgears, but maybe the absence of
some AGP feature (e.g., the GART) disables some speed-critical part of
the driver. I remember that the GART size had a significant effect on
UT2004 (don't remember if there was an effect on glxgears).

- anton
--
M. Anton Ertl Some things have to be seen to be believed
anton@xxxxxxxxxxxxxxxxxxxxxxxxxx Most things have to be believed to be seen
http://www.complang.tuwien.ac.at/anton/home.html
.

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