From: paul swed
Thanks.
I really like the idea that a Rassberry Pi could be a time server. Maybe
enough to get me going.
Thanks
===============================
Paul,
I wrote up my experiences with the Raspberry Pi as a standard NTP server
here:
http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html
and the performance can be seen here:
http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html#current
http://www.satsignal.eu/mrtg/performance_ntp-pn.php
Interestingly, the second RPi card is doing better than the first, and it
does /not/ have gpsd installed, so relying on the LAW/WAN for its source of
coarse seconds. But it has a timekeeping GPS and a slightly better located
antenna as well - both antennas are indoors and some drop-outs show as
spikes on RasPi-1. No gpsd appears to mean less CPU load. Compare:
http://www.satsignal.eu/mrtg/performance_raspi-1.php
http://www.satsignal.eu/mrtg/performance_raspi-2.php
It looks like sub-microsecond might be possible in a temperature-controlled
environment, as the main drift seems to be at 05:30 when the heating turns
on:
http://www.satsignal.eu/mrtg/performance_ntp.php?period=week
Raspberry Pi 2 was only switched to GPS from LAN-only sync a few days ago.
Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
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