[ntp:questions] Loopstats updated less frequently than expected

David J Taylor david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Sat May 23 16:57:35 UTC 2009


Unruh wrote:
[]
>> As I have maxpoll set to 6, I would have expected entries no more
>> than 64s apart.  What am I failing to understand here?  The poll
>> values reported in ntpq -p are 64, 64 and 1024 - as expected.
>
> You are forgetting that ntp throws away 7/8 of the stuff it collects.
> (This is in an attempt to counter round trip biases).
> Thus you would expect to have 8 times the max poll interval between
> loopstats. (it is random so it is not always exactly 8 times sometimes
> less, but never more, but it averages out to pretty close to 8 times.)

Thanks for that, Bill.  With the servers with a GPS directly attached, I 
typically get 5400 lines in the log file, for a 16s polling interval. 
That's one line per poll, not one line per approximately eight polls.

Cheers,
David 




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