Hal Murray wrote:
Clearly I need to fudge a time offset for the gps, corresponding to
mean hardware and os delays. My goodish servers are showing offsets of
between -6ms -- +4ms and it is unclear which one I should choose as a
Recent experience has taught me that the GPS signal is inherently *much*
more accurate than 'goodish' servers.
Compare:
http://www.nodomain.org/ntp/index.php?rrd_id=2
.. GPS source.. loses the satellite occasionally so you get peaks but
otherwise dead flat.
http://www.nodomain.org/ntp/index.php?rrd_id=3
.. Synced off the GPS source above over the network, crossing a switch.
Network sync isn't even close to what you get off a proper timesource -
to try to calibrate a GPS off it just isn't going to get sane results.
Tony
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