[ntp:questions] Loop Frequency and Offset

Miguel Gonçalves mail at miguelgoncalves.com
Mon Sep 26 13:41:02 UTC 2011


2011/9/26 Dave Hart <hart at ntp.org>

> 2011/9/25 Dave Hart <hart at ntp.org>:
> > 2011/9/25 Miguel Gonçalves <mail at miguelgoncalves.com>:
> >
> >> tick# tail -10 /var/log/ntp/loopstats
> >> 55829 66927.314 0.000011263 185.398 0.000000620 0.001452 4
> >> 55829 66942.315 0.000011355 185.398 0.000000402 0.001358 4
> >> 55829 66957.315 0.000010197 185.398 0.000001026 0.001270 4
> Nice theory, Dave, but you overlooked that all those offsets are
> within 500 usec of zero (in fact within +10 to +12 usec), which would
> trigger the end of initial offset convergence and unclamping the
> frequency compensation.
>

What is a typical offset of the loop without using special oscillators? Is
less than 1 us achievable?

Cheers,
Miguel



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