On Sep 15, 2011, at 5:09 PM, Richard B. Gilbert wrote:
> Until you have read and understood Dave Mills' book on the subject, just 
> consider the defaults to be mandatory!

Defaults should be a "best recommendation for the widest range of reasonable 
circumstances"; they aren't mandatory, and they aren't something which cannot 
be adjusted for beneficial results, at least if you have some idea as what you 
are doing and validate the consequences of a change via measurement.

And while I'm not David Mills or Poul-Henning Kamp, either, I've spent more 
than a casual effort towards understanding ntpd's source code and the 
corresponding kernel timekeeping mechanisms in kern/kern_time.c & kern_tc.c.  
You can find some interesting threads related to this such as:

  http://lists.freebsd.org/pipermail/freebsd-current/2005-October/057269.html
  http://lists.freebsd.org/pipermail/freebsd-stable/2009-September/051803.html

Regards,
-- 
-Chuck

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