Thanks for all the great answers. Now for a harder question, how does
the accuracy of the local clock source
affect the accuracy of ntpd.
Thanks
Chip
Chip,
It also depends on the OS in use. Even with a timekeeping GPS (better
than a microsecond), Windows does not keep time as well as FreeBSD.
Compare FreeBSD: PC Pixie, Windows: PCs Feenix & Stamsund
http://www.satsignal.eu/mrtg/performance_ntp.php
In my experience, even given an accurate source (e.g. a PC syncing to a
FreeBSD stratum-1 server), the network performance may have a greater
influence that the performance of the reference clock, especially if that
network contains gigabit components, or off-site connections, wireless,
ADSL etc.
If you want the best accuracy, ensure your PCs have a serial port, and
pipe a pulse-per-second signal round your lab. NTP works well with that.
Cheers,
David
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