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[wlug] graphics speed

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Glenn Ramsey glenn@c...
Tue Sep 23 09:51:50 NZST 2003


I have a scientific visualisation app (cgui from ) that I have tested on 3 different 
machines and I have found that the graphics performance is opposite to 
what I expected.  I was wondering if anyone could give me some pointers 
about how to figure out what might be causing the slowness on 2 of the 

The machines are:

1. Compaq Presario 2100 series laptop. Athlon XP 2400, 512Mb Ram, Ati 
Radeon IGP320M. The accelerated features of this graphics chipset are 
not supported by XFree86.

2. PC with AMD Duron 900 + Matrox GA400 graphics adpator.

3. PC with Athon XP 1800, running Xvnc 3.3.6. Viewed across 100 Mbit 
ethernet from vncviewer on Windows.

The thing that is confusing me is that when viewing a shaded bezier 
surface the best performance is on machine 3 - using vnc. I would have 
expected machine 1 at least to have equivalent performance to machine 3 
given that the rendering is being done in software in both cases. But it 
is noticably a lot slower on machine 1, any ideas why that might be?

I haven't done any framerate measurements, the "test" I used was to load 
a human torso model and rotate it with the mouse.

Machine 2 was the slowest at this task, so apparently there is no 
hardware support for shading in the mga driver or the driver doesn't 
like my hardware.  Machine 2 does however run glxgears the fastest.

Any suggestions appreciated.


Glenn Ramsey <glenn@c...> 07 8627077

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