[ntp:questions] What is the NTP recovery time from 16s step in GPSserver?

unruh unruh at invalid.ca
Thu Nov 1 18:23:34 UTC 2012


On 2012-11-01, David Woolley <david at ex.djwhome.demon.invalid> wrote:
> unruh wrote:
>> On 2012-11-01, David Woolley <david at ex.djwhome.demon.invalid> wrote:
>>> David Taylor wrote:
>>>
>>>> On a recent restart from cold, the server here took about 15 minutes to 
>>>> get to within 250 microseconds, and about an hour to be within 10 
>>>> microseconds.  Ultimately it is within about 3 microseconds.
>>> 3 microseconds of what?  How are you measuring the difference between 
>>> software clock time and UTC, independently of NTP?
>> 
>> I think he means the clock offset from a PPS signal. (otherwise that
>> does not mean much) 
>> 
> Well actually, he means the offset from the estimated PPS time, not the 
> actual PPS time.

If you mean by "estimated" the time offset as determined via the
interrupt processing then I agree.




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