Date: Mon, 15 Jul 1996 16:11:22 -0300 From: Harlan Stenn <Harlan.Stenn@pfcs.com> To: 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: <108.837461482@mumps.pfcs.com> In-Reply-To: sthaug@nethelp.no's message dated Mon, 15 Jul 1996 14:28:34. <20426.837433714@verdi.nethelp.no>
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How stable is the reference you're syncing with? If it's not being
stable, that's one possibilty.
More likely is that the clock in your machine is a bit off. How big is
the drift value in /etc/ntp.drift (check for the "driftfile /wherever" line
in ntp.conf)? The first number should be between -105.xxx and 105.xxx.
If it's not, you'll need to run tickadj -t <something> (once when you
decide to change it, and at boot time).
Here's a script I've used that usually does the right thing. Note that
if you change the "base" value of tick using "tickadj -t <something>"
then this script will show you the size and amount of change, not the
actual value to put in.
H
#! /usr/bin/perl
#
# drift of 104.8576 -> -1 tick. Base of 10000 ticks.
#
$df="/etc/ntp.drift";
$base=10000;
$cvt=104.8576;
$v1=0.;
$v2=0;
if (open(DF, $df))
{
if ($_=<DF>)
{
($v1, $v2) = split;
}
while ($v1 gt $cvt)
{
$v1 -= $cvt;
$base--;
}
while ($v1 lt 0)
{
$v1 += $cvt;
$base++;
}
}
printf("%.3f %d\n", $v1,$v2);
print("$base\n");
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