[ntp:questions] Re: 4.2.1-RC1 on FreeBSD 4.11 doesn't seem to discipline the local clock

Joshua Coombs jcoombs at gwi.net
Thu Mar 9 15:33:58 UTC 2006

"Harlan Stenn" <stenn at ntp.isc.org> wrote in message 
news:ywn9wtf4nk8n.fsf at ntp1.isc.org...
> The output you sent us seems to have been from a "fresh" start of 
> ntpd, as
> the "reach" was never more than 3.
> Why do you think your locak clock was not being disciplined?
> H

Correct, I had reverted to 4.1.0a when I first noticed the huge 
offsets.  Letting 4.2.1-RC1 run yesterday it appears that it is in 
fact discipline the clock, but can't seem to settle to stable 
operation.  The clock would begin to run off in one direction, ntpd 
would lower the poll intervals, over do the correction value, then 
raise the poll intervals while the clock came back to 0 offset.  The 
pattern would repeat as it swung past in the other direction.  Running 
4.1.0a, ntpd very quickly reigns in the offset, and then stays within 
10ms of true time without the drama and poll interval ramps of 

The huge swing initially is what made me fear it wasn't discipling the 
clock, letting it run longer shows that it is, but for some reason 
can't find a happy stable state.

I'm setup to collect loopstats now, and because I have 3 other clocks 
that are stable I can use this machine as a guinea pig for a bit, how 
should I proceed to diagnose this?

Joshua Coombs 

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