> > Hmm, I wasn't sure. Why is it needed? How outdated can the
> > result of RDTSC / RDTSCP be?
> >
> > If I do:
> > rdtscll(a)
> > ...
> > rdtscll(b)
> > is it guaranteed that (b > a) ?
>
> On a single CPU this is always guaranteed. Even on AMD.
It's not guaranteed on Intel at least (but happens to work on P4)
-Andi
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