Messages in this thread | | | Date | Mon, 12 Jul 2004 16:19:12 +0200 | From | Ingo Molnar <> | Subject | Re: [ck] Re: [announce] [patch] Voluntary Kernel Preemption Patch |
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* Chris Friesen <cfriesen@nortelnetworks.com> wrote:
> >it was reporting more accurate latencies, except that there were strange > >spikes of latencies. It turned out that for whatever reason, userspace > >RDTSC is not always reliable on my box (!). > > Would the fact that rdtsc is not serializing have any effect here? Or > would that be a small enough error to not have any effect?
even though it's not serializing (to other instructions), one would expect the '64-bit cycle counter' to be fetched atomically. And several milliseconds cannot be explained with any micr-op delays anyway.
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