Brad Knowles wrote:
> At 4:53 PM +0000 2005-09-29, John Pettitt wrote: > >> I don't agree with Brad that 10ms is as good as it gets, > > > If your HZ= setting is 100, then 10ms is, by definition, as good > as it gets. At least, when it comes to measuring short-term single > event clock timing matters. > > No HZ is not the gating factor because the system returns a time based on the processor cycle count (*) On my FreeBSD Celeron box a tight loop calling gettimeofday() shows an average increment of 1.4 microseconds per loop and yes the values change on every call. John (*) on machines with APM enabled all bets are off because the CPU frequency is not stable. _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
