> > We do 5uS per transition 4 transitions per bit, 64bits. So thats 1.2mS
> > or using the PM timer thats 0.25 seconds
>
> OK ya lost me...;-)
I got my maths wrong by a slight factor of 1000, ignore me - there is a
reason I didnt do maths at university 8)
> Both Windows and FreeBSD-CURRENT use the PM timer for udelays. It is 3579545
> Hz. ~2.71 ticks per usec. Read the PM timer, add (2.71 * 5), loop on reading
> the PM timer until it reaches that, and (give or take) you have a 5us delay
> that does not depend on the TSC.
4MHz is not actually too bad at all, providing the reading overhead is
low
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This archive was generated by hypermail 2b29 : Sun Sep 30 2001 - 21:01:06 EST