[ntp:questions] Confused about pool rotation

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Thu Feb 7 07:18:58 UTC 2013

John Hasler wrote:
> Robert Scott writes:
>> So I am trying to achieve 12 ppm frequency calibration by developing a
>> temporary local time stamp that is disciplined by SNTP.  I figure two
>> SNTP samples about 2 to 4 hours apart will give the required frequency
>> accuracy, assuming typical SNTP jitter.
> I don't see why this should be better than (or even as good as) using
> the system clock as disciplined by NTP.

It isn't, as long as the system is running a true NTPD implementation 
instead of a bunch of sawtooth SNTP adjustments...

- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"

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