Hiroshi Shimamoto writes:
> Dave Johnson wrote:
> > mach_prepare_counter();
>
> It's a really rare case, but if SMI interrupt takes CPU here, just after
> prepare and before rdtscll, it makes delta64 shorter than expected one.
> Is it possible? And how about moving rdtscll before mach_prepare_counter()?
>
> > rdtscll(start);
Yep, rare indeed (about 1 instruction). Moving the start read before
the prepare call should solve that one too providing the setup doesn't
take any real measurable time.
--
Dave Johnson
Starent Networks
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