Hello!
I think that one important step is missing:
David L. Mills wrote:
Plan B
1. Run ntptime -f 0 to remove any leftover kernel bias.
Here one should also remove the frequency file "ntp.drift". Otherwise
NTP daemon reads it and configures the kernel clock adjustment
parameters. In this case one ends up measuring a residual frequency
error as part of the frequency error has been compensated.
2. Configure for a reliable server over a quiet network link.
3. Start the daemon with disable ntp in the configuration file.
4. Record the offset over a period of hours. Do a least-squares fit; the
regression line slope is the frequency.
Please see URL below for the full story:
https://ntp.isc.org/bin/view/Support/HowToCalibrateSystemClockUsingNTP
Cheers
Daniel
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