[ntp:questions] Jitter versus polling interval

David J Taylor david-taylor at blueyonder.neither-this-bit.nor-this.co.uk
Sun Mar 1 18:50:22 UTC 2009


Unruh wrote:
[]
> YOu have a couple of answers, both of which are probably wrong and are
> asking which it is. As stated your premise is bad. It depends is the
> best
> answer you are going to get. It depends on the source of the jitter.
> Measurement noise? clock drift noise? assymetric network delays? Day
> of
> week? phase of moon?..... All make a difference.

The noise I see on a typical system - typical Internet connections with no 
local precision reference.

> And it depends on how it is compensated. Mill's Markovian feedback?
> Chrony's linear regression? ...

Regular, official NTP.  I don't run chrony.

David 




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