Messages in this thread |  | | Subject | Re: 'Detected 19943xxx Hz processor'-fluctuations... | | From | Florian Weimer <> | | Date | 13 Jan 1999 08:32:00 +0100 |
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Robert Woodcock <rcw@debian.org> writes:
> > > Just for kicks I decided to let mhz.estimate run for a while in a > > > loop, that way I get thousands more quite-possibly-less-accurate > > > statistics. Out of 59000 runs, here are the most deviant 20: > > > > > gettimeofday(&tvstart, &tz); > > > cycles[0] = rdtsc(); > > > gettimeofday(&tvstart, &tz); > > > > Which processor type did you select when you compiled the kernel under > > which the test was run? > > PPro, but that's irrelevant.
Are you sure? AFAIK, gettimeofday() internally uses rdtsc() on those processors. Aren't you trying to measure the precision of a clock with the same clock?
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