[ntp:questions] Synchronize clocks without a reference clock
Richard B. gilbert
rgilbert88 at comcast.net
Sat Mar 31 17:27:45 UTC 2007
Hal Murray wrote:
>>Well, I was mainly thinking of the case where you have orphan mode set
>>up as a fallback to external servers - then the drift value that has
>>been calculated while external servers were reachable is a good "quality
>>indicator". But I assume the non-"masters" in an orphan-only setup
>>calculate a drift relative to the "master" - in that case, if you're
>>happy with the drift of the "master", you will be least unhappy if the
>>host with the lowest drift relative to the departed "master" is chosen
>>as the new "master".
> The value of drift doesn't have any correlation to goodness.
> What you want is best stability. What is the peak-peak value
> of the drift measured over several days? Or something like that.
I don't think that is correct. No single value of "drift" tells you
anything about stability. It only tells you the frequency error of the
uncorrected clock. A time history of drift MIGHT tell you something
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