[ntp:questions] Question on how to Slew time in NTP (David Woolley)
David J Taylor
david-taylor at blueyonder.co.uk.invalid
Fri Dec 16 06:55:25 UTC 2011
"Richard B. Gilbert" <rgilbert88 at comcast.net> wrote in message
news:C5-dneE6pqwDtnfTnZ2dnUVZ_o2dnZ2d at giganews.com...
[]
> Is this something relatively new? ISTR that it still took about thirty
> minutes to get a reasonable facsimile of the correct time even when
> restarting with a good drift file.
>
> I wish I could draw a graph here. Since I can't, I'll try to describe
> it. Start with an error of twenty or thirty seconds, mad dash to
> correct the error, followed by overshoot, and ringing. Ringing decays
> slowly. If I were at the controls, I'd be tapping the brakes as we
> approach zero error!
I would try a recent NTP with configuration parameters appropriate to the
environment you're using, with a valid drift file. A 20s error should be
corrected by a step, followed by fine adjustments. I'm not talking
microsecond offsets, though.
Cheers,
David
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