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From: sthaug@nethelp.no
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To: bde@zeta.org.au
Cc: current@freebsd.org
Subject: xntpd stepping clock backwards? (was: Re: NFSv3 fixes for review)
In-Reply-To: Your message of "Sun, 14 Jul 1996 18:05:15 +1000"
References: <199607140805.SAA20603@godzilla.zeta.org.au>
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Date: Mon, 15 Jul 1996 14:28:34 +0200
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> >This fix seems to work right for me. I'm nervous about the use of the
> >timeval, mostly because I'm not sure that it is monotonically
> >increasing in the ntpd time synchronization case (and haven't
> >looked deep enough to verify that the reported time from the
> >microtime is not affected by adjustments.
> 
> xntpd only does tiny adjustments which can't possibly make the clock
> go backwards.  OTOH, ntpdate or ordinary `date' can set the clock back
> by years.

Then why does my syslog show the following? It sure looks to me like xntpd
sometimes steps the clock backwards. This is on 2.2-960612-SNAP.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no
----------------------------------------------------------------------
Jul  7 14:57:36 verdi xntpd[84]: time reset (step) 0.151413 s
Jul  7 21:34:16 verdi xntpd[84]: time reset (step) 0.133152 s
Jul  9 17:32:48 verdi xntpd[84]: time reset (step) -0.135963 s
Jul  9 17:37:49 verdi xntpd[84]: time reset (step) 0.133687 s
Jul 10 00:15:54 verdi xntpd[87]: time reset (step) -0.321460 s
Jul 11 00:12:52 verdi xntpd[84]: time reset (step) -2.264120 s
Jul 11 03:24:08 verdi xntpd[84]: time reset (step) -0.211536 s
Jul 11 13:28:57 verdi xntpd[84]: time reset (step) -0.146236 s
Jul 11 22:45:37 verdi xntpd[83]: time reset (step) -0.669474 s
Jul 14 17:28:57 verdi xntpd[83]: time reset (step) 0.159320 s
Jul 15 05:24:55 verdi xntpd[83]: time reset (step) 0.128810 s