[ntp:questions] Polling time backoff

David Woolley david at ex.djwhome.demon.invalid
Thu Dec 3 21:33:02 UTC 2009

Rob wrote:

> And of course it is always "better" to have a short poll interval, for
> any kind of error that you want to correct.  You may need to add some
> filtering to the samples before feeding the result in the loop, but 16
> samples in 1024 seconds will always be providing better information than
> a single sample in that interval.
> I understand that it does not work like this in the ntp reference
> implementation, but that is a characteristic of the implementation, not
> of the sampling.

My understanding is that ntpd significantly oversamples, relative to its 
loop filter bandwidth, so further oversampling is unlikely to make a lot 
of difference.

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