[ntp:questions] Ntpd in uninterruptible sleep?

Dave Hart hart at ntp.org
Thu Nov 10 10:39:49 UTC 2011


On Thu, Nov 10, 2011 at 07:39, A C <agcarver+ntp at acarver.net> wrote:
> I did have a question about the debug data out of -D2.  What does the "head"
> parameter indicate in a poll_update?  I notice that most of the time head is
> zero but once in a while it's something else.  The log of the debug data
> shows it's gone over 500 a couple times.
>
> This one is zero, I lost the bigger one which
>>
>> poll_update: at 3966 127.127.22.1 poll 4 burst 0 retry 0 head 0 early 2
>> next 16

This is the transmit headway, reported by the "rv <associd>" or "rv
&1" (or &2 for second association, etc.) as headway=

See http://www.eecis.udel.edu/~mills/ntp/html/rate.html#guard for an
explanation.  This is the output or transmit counter described.

Cheers,
Dave Hart


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