On Thu, September 20, 2007 21:00, Arnold Schekkerman said: > My theory: a st1 may fluctuate due to load, temperature changes, signal > loss, etc. which is filtered by a st2. A st2 is less popular, so a well > configured st2 only fluctuates due to temperature changes. Therefore, it's > best to have a local time source or sync with st2 :-) > > Arnold
Arnold, S1 servers with good timesource will not be filtered in any good way by a S2 server. A GPS timesource will give a PPS-pulse at better than 1us. This is some decades better than achivable over a LAN - more so a WAN. Signal loss -- a decent antenna placement will trivially give more than enough satellites in view for timing. Temperature changes -- since a local time source will give a much higher measurement rate (64sec to 1sec (for pps)) even quick temperature changes - and the resulting freq change for the local oscillator -- will be easily tracked by ntpd. Find a S1 without congested network pipes. That will give the "best" performance! But maybe you do not need "best" performance on many computers. AND if you need the performance its not hard or very expensive to setup your local GPS time source these days. -- Björn _______________________________________________ timekeepers mailing list [email protected] https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers
