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and don't minimize or defocus the glxgears window when running it because it will show wrong results. (however if you have software rendering minimizing the window will make no effect, but if you've hardware acceleration, it will.
Your numbers look a little weird to me... You're getting 500-600fps for the first 40s, which is a little more reasonable for your video card's capabilities, and then suddenly jump to 10's of thousands of frames per second? What's even more interesting is that your numbers drop back to where they should be in your last iteration.
Did you cover the window, or minimize it, or do something else to obscure the window so it wasn't fully being drawn? And what resolution are you running your desktop at, since that seems to have an effect on the result on my system?
For reference, my system's configuration is:
Athlon XP 2200+
1024MB DDR366 (OCZ PC3000)
ATI Radeon 9550 256MB DDR (I used to have a 9600Ultra, but that bit it with some help from an ESD)
DRI enabled, using FireGL's OpenGL render engine
And the result I get is pretty consistently 1379fps when I haven't touched the window, and over 3,000fps when the window is shaded or obscured.
And my laptop's configuration:
AMD Athlon4 1.2GHz (1197MHz actually)
256MB PC133 (128 soldered on board, 128 in expansion slot)
S3 TwisterK (using the built-in Savage driver), 16mb shared video
No DRI, using Mesa OpenGL engine
That one gets exactly 100fps if I leave the window alone, and exactly 200fps if I obscure it.
EDIT: oh yeah. Desktop is 1920x1440@75Hz. Laptop is 1024x768@whatever the LCD does