[ntp:questions] NTP with GPS and RTC

unruh unruh at invalid.ca
Fri Apr 26 23:38:12 UTC 2013


On 2013-04-26, Harlan Stenn <stenn at ntp.org> wrote:
> unruh writes:
>> Define occasionally. Unfortuneately ntpd requires about 5-10 hours to
>> rediscipline a clock to ultimate accuracy when the connection comes up
>> again, so if the connection time is shorter than that, chrony (assuming
>> you run linux or some unix) is a better choice ( faster lock and
>> discipline time). It also allows you to "trim by hand". Ie, if you can
>> phone into the device, and find it is say 1 min off, you can tell chrony
>> to correct that offset by hand.
>
> And Bill's statement above also depends on your definition of "better".
>
> My understanding is chrony will do an excellent job of tracking the
> upstream source it is listening to.  That is not necessarily the same as
> maintaining better system time.

Sorry, what other definition do you have of "better system time"? All
anything can do is to use a source and assume that that sourc is a good
source. 
>
> H



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