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From: seeger@MANATEE.CIS.UFL.EDU (F. L. Charles Seeger III)
Newsgroups: comp.protocols.time.ntp
Subject: Re:  NTP and the infamous SPARC clock problem (again)
Message-ID: <9012031920.AA05727@manatee.cis.ufl.edu>
Date: 3 Dec 90 19:20:33 GMT
References: <9012031311.aa05921@huey.udel.edu>
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+------ Mills@udel.edu wrote (Mon,  3-Dec-90, 18:11 GMT):
| 
| It is possible to widen the aperture NTP uses to distinguish clock
| jitter from broken clocks. Ex box this aperture is +-128 ms, but could
| easily be made much larger. However, if a few hundred milliseconds is
| being yanked from under it every 30 seconds or so, NTP is not the protocol
| of choice. Run NTP on a stable platform somewhere and a bugged timed to
| keep the rascals in line.

I have patched timed so that when it is run in master mode it won't update
the system clock.  Otherwise, having ntp and a timed running on the same
machine can cause trouble.  This code has survived through one incident
where a timed with the wrong time got elected to be "master".

If anyone wants the patches, send me mail.

Chuck
--
  Charles Seeger    E301 CSE Building             Office: +1 904 392 1508
  CIS Department    University of Florida         Fax:    +1 904 392 1220
  seeger@ufl.edu    Gainesville, FL 32611-2024