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

David Taylor david-taylor at blueyonder.co.uk.invalid
Thu Nov 1 06:44:47 UTC 2012


On 31/10/2012 21:04, unruh wrote:
> On 2012-10-31, Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
[]
>> NTPD is a "slow starter"!  Ideally, you will only start it once and
>> let it run for a few months.
>>
>> How slow is a "slow start"?.  It can take NTPD up to ten hours to
>> synchronize within + or - 50 nanoseconds with whatever you are using as
>
> It will never get to within 50nsec. The interrupt processing is far more
> variable than that. You might get to withing a few micro seconds.

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.
-- 
Cheers,
David
Web: http://www.satsignal.eu



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