[ntp:questions] Re: Clock selection?
David L. Mills
mills at udel.edu
Sun Jan 18 16:37:39 UTC 2004
Richard,
See the clustering algorithm slide in the architecture briefing at the
NTP project page linked from www.ntp.org. See also the error budget
slide in the same briefing. The concepts are really simple: order the
servers by stratum and synchronization distance and toss out the
outlyers until only three survivors remain. The devil of course is in
the details.
Dave
"Richard B. Gilbert" wrote:
>
> Can anyone explain the clock selection here? Why would the clock with
> the highest delay, offset, and jitter be selected? To my unpracticed
> eye, 128.59.39.48 appears to be the cleanest source of time!
>
> sunblok_# ntpq -p
> remote refid st t when poll reach delay offset
> jitter
> ==============================================================================
> *louie.udel.edu 128.4.40.10 2 u 682 1024 377 45.499 9.590
> 11.502
> +filbert.cc.colu 128.59.39.48 2 u 645 1024 377 14.715 2.824
> 0.757
> +otc2.psu.edu 128.118.25.12 2 u 806 1024 377 22.974 -4.068
> 1.317
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