Daniel Walker wrote:
Seems like the check should really be using something like time_before()
time_after() which takes the rollover into account .. What I don't
understand is why we don't see those on x86 ..
Probably due to the fact it is a 64-bit counter. Even with
a free running rate of 10Ghz it would take nearly 60 years
to wrap.
On PPC and ARM 32-bit counters seems to be common which limits
range unless a prescaler is available. The better solution is
to detect wrap as a prescaled 32 bit measurement will eventually
run out of usable resolution as core frequency increases. That is
assuming 64-bit counters don't eventually show up in these
architectures.
-john
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