[ntp:questions] Re: Garmin GPS18USB and NTP on Win2k

Eugen COCA ecoca at eed.usv.ro
Sun Jun 26 06:17:12 UTC 2005


About running on NT operating system at:
http://www.eecis.udel.edu/~mills/ntp/html/build/hints/winnt.html we
see:

Accuracy
Greg Brackley has implemented a fantastic interpolation scheme that
improves the precision of the NTP clock using a realtime thread (is
that poetic or what!) which captures a tick count from the 8253 counter
after each OS tick. The count is used to interpolate the time between
operating system ticks.

On a typical 200+ MHz system NTP achieves a precision of about 5
microseconds and synchronizes the clock to +/-500 microseconds using
the Trimble Palisade as UTC reference. This allows distributed
applications to use the 10 milliseconds ticks available to them with
high confidence.




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