[ntp:questions] making sense of stats offset values [or trying to...]
david at ex.djwhome.demon.co.uk.invalid
Tue Apr 28 07:18:12 UTC 2009
David J Taylor wrote:
> David Woolley wrote:
>> Bruce Lilly wrote:
>>> # ntpq -p
>>> remote refid st t when poll reach delay
>>> offset jitter
>>> *megatron.blilly 18.104.22.168 2 u 27 64 377
>>> 2.927 0.296 0.122
>>> # ntptrace
>>> megatron.blilly.net: stratum 2, offset 0.002120, synch
>>> distance 0.024161
>>> Note that ntpq reports an offset of 0.296 milliseconds from
>>> the local host to its system peer, while
>>> ntptrace reports an order of magnitude larger offset!
>> 2.120 milli-seconds is not an order of magnitude different. I think
>> you are expecting milliseconds to have three zeros after the decimal
>> point; they don't!
> I'm missing something here - how are 0.296ms and 2.120ms not about "an
> order of magnitude different"?
My mistake. I looked at the decimal point on the delay; it wrapped to
the start of the line.
However, as noted, that is the difference between a one shot measurement
and a filtered one.
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