> so the only thing left is to poke the PCI bus directly and measure that
> speed. Unfortunately i have found no way to create some reliable
> nonintrusive transaction on the PCI bus that can be measured. maybe
> reading the config space takes some constant number of PCI cycles?
reading/writing to a frame-buffer - using rdtsc ?
Sure, not everyone has a frame-buffer - but its probably going to be
the most common thing you can probe unobtrusively (well, it will do
no harm) that many machines will have.
Actually, since not everyone has a frame-buffer, maybe it could be
done under X using DGA to get access to the video ram?
-cw
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