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From: ehrlich@cs.psu.edu (Dan Ehrlich)
Newsgroups: comp.protocols.time.ntp
Subject: XNTPD V1.3 on Suns running SunOS 4.1.1
Message-ID: <1?6Go5!e@cs.psu.edu>
Date: 4 Feb 91 22:30:07 GMT
Sender: news@cs.psu.edu (Usenet)
Organization: Computer Science Department, Penn State University
Lines: 31
Nntp-Posting-Host: colossus.cs.psu.edu


I have xntpd running on a number of different model Suns and IBM RTs and
have noticed that the frequency drift is very different depending on which
machine I look at.  Here is what I have in /etc/ntp.drift on three of my
systems:

	Sun 4/490	0.126807074
	Sun 4/380	-0.043642800
	IBM RT 6150	0.005678721

Here are a few questions I hope an NTP guru might be inclined to answer:

	1) Are there any patches to SunOS 4.1.1 in the area of time keeping?
	   I had heard that adjtime(2) was broken in some releases of SunOS
	   but have not been able to confirm this.

	2) Does the 4/380 really have a better clock that a 4/490?

	3) What might explain the differences in the drifts between the
	   Suns?

	4) Does the IBM RT have a clock that is an order of magnitude better
	   than a Sun?

All of these systems have been running xntpd v1.3 for at least a week.

Thanks in advance.

--
Dan Ehrlich - Sr. Systems Programmer - Penn State Computer Science
<ehrlich@cs.psu.edu>/Voice: +1 814 863 1142/FAX: +1 814 865 3176