[ntp:questions] Re: soekris 4501 that won't settle
Joshua Coombs
jcoombs at gwi.net
Tue Mar 21 04:27:29 UTC 2006
"Joshua Coombs" <jcoombs at gwi.net> wrote in message
news:P7adnXboCdsf4oLZRVn-pw at gwi.net...
> My nanobsd testbed has decided to drive me up a wall. When I set it
> loose, it starts hunting for a pll adjustment value, swinging wider
> and wider with each period. When I last restarted ntpd to try a
> conf change, it was varying the pll freq by 40ppm over the course of
> one of it's sweeps.
>
> Plotting the adjustment value over time generates a lovely sine wave
> with a static period but an exponentially growing amplitude centered
> on -25ppm.
An interesting extra data point, the period seems to be approx 6.8
hours for it to sweep the pll freq from a high, to a new low, back up
to a new high. That works out to being 12 poll intervals nearly
exactly using my 2048 poll period?
Joshua Coombs
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