Timekeeping oddities on MacMini G4s
Achim Gratz
Stromeko at nexgo.de
Mon Feb 6 19:00:37 UTC 2017
Hal Murray writes:
> Stromeko at nexgo.de said:
>>> # ntpq -c 'rv 0 frequency'
>>> frequency=-0.928558
>> Make that number go into the loopstats file as well? I don't suppose I
>> should log the output of ntpq to benefit from that extra precision.
>
> Is anybody actually running gear where more than 3 fractional digits is
> interesting?
Yes. It is (surprise, surprise) a rasPi 2B that I've "ovenized", sort
of. The quantization to single digit ppb is quite noticeable in the
residuals of predicted vs. actual frequency deviation. Or rather was,
now that this number resolves down to ppt.
Regards,
Achim.
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