[Dri-devel] mach64: performanc = f (phys. screen res.)

[Felix <fx...@gm...>]

[Sorry, my last message got sent a little early.]

Hi,

I recently found out that the 3d performance of the mach64 branch (in
terms of glxgears frame rates) is related to the physical screen
resolution. I got the following glxgears frame rates with different
resolutions:

1152x864: 155.2 fps
1024x768: 165.6 fps
  800x600: 209.6 fps
  640x480: 229.4 fps
  512x384: 218.0 fps
  400x300: 235.0 fps

It is interesting that there is a decrease in performance from 640x480 
to 512x384. 512x384 and 400x300 are defined as double scan equivalents 
of 1024x768 and 800x600 respectively in my XF86Config. So the CRT 
refresh seems to play a role in this (I'm don't have a laptop, it's a 
ATI XPert98 in a desktop PC).

I'm wondering whether these effects are a bug or a feature.

Regards,
    Felix

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