Hello,
I'd like to contribute to the discussion about improving computer clock
accuracy, that started yesterday at TICTOC meeting.
According to our experiments and evaluation of our NTP servers, very
important issue is computer oscillator stability. I replaced the quartz
14.318 MHz at mainboard by a OCXO. We use this hacks in more than 10
servers, both NTP and Time-stamp authorities. We reached system clock
accuracy few microseconds (PPS disciplined server) resp. less than 100
microseconds (Stratum-2 with primary NTP in the same LAN). Note: it is
objective time offset measurement outside the system. Offset reported in
NTP log loopstats provides better numbers.
Some of these results are described in Cesnet technical reports
http://www.cesnet.cz/doc/techzpravy/2007/ntp-server/
and
http://www.cesnet.cz/doc/techzpravy/2008/time-stamp-authority/
regards,
Vladimir Smotlacha
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