David,
As you might see from the online documentation, much of the tutorial
material has been largely rewritten. Awhile back, some kind soul pointed
out a logical discrepancy in the select algorithm. That was repaired,
the code updated and the documentation refreshed. The pages linked from
"How NTP Works" is offered as a definitive tutorial that might clear the
air on these issues.
Dave
David Woolley wrote:
Miroslav Lichvar wrote:
On Tue, Jan 04, 2011 at 02:35:13PM -0500, Richard B. Gilbert wrote:
The problem with using only two servers is that NTPD has no means of
determining which is more nearly correct when the two differ, as
they inevitably will!
ntpd will pick the one with smaller distance if their intervals
overlap. Otherwise they both will be falsetickers.
In this case, ntpd will use an average of both of them, when the
confidence intervals overlap; it will not pick just one except for the
purposes of providing downstream error statistics.
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