On 2011-08-27, David J Taylor <[email protected]> wrote: >> I read somewhere that it takes an ntpd 24 hours to truly sync up to a >> stratum 2 master. >> >> Is this true? >> >> Thanks >> >> Chip > > Chip, it depends on the accuracy you need. To get within some > milliseconds, perhaps a minute or less. How accurate do you need, and > what is your connection to the server(s)? You may be able to tune NTP to > meet your particular needs rather than relying on the out-of-the-box > configuration.
See the last two graphs on www.theory.physics.ubc.ca/chrony/chrony.html which are the response of ntp to a rate change from about215PPM to 168PPM The "halving time" for the offset is about .04 days, which is about 1 hr. Thus it depends on how far off you clock is. Also this graph is for the poll interval of 16 sec. ( a gps receiver) For longer poll intervals the time will be proportionately longer. _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
