Date: Tue, 16 Jul 1996 10:00:03 +1000 From: Bruce Evans <bde@zeta.org.au> To: dwhite@resnet.uoregon.edu, sthaug@nethelp.no Cc: bde@zeta.org.au, current@FreeBSD.ORG Subject: Re: xntpd stepping clock backwards? (was: Re: NFSv3 fixes for review) Message-ID: <199607160000.KAA24680@godzilla.zeta.org.au>
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>> > 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. >I think you are misinterpeting the log entry. xtnpd works by adjusting >the length of a 'tick' so the clock 'speeds up' or 'slows down' as >necessary. This adjustment is called 'slew' and is inserted in very, >very small increments. But time continues to move forward, even if it >means slewing the ticks for quite a while. That's what I thought. Unfortunately, xntpd really does step the clock in some cases, unless SLEWALWAYS is defined. Bruce
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