[ntp:questions] Re: soekris 4501 that won't settle

John Pettitt jpp at cloudview.com
Tue Mar 21 05:59:35 UTC 2006


Joshua Coombs wrote:
> 
> "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

You made the changes documented here http://phk.freebsd.dk/soekris/kern45xx.html right?

John




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