David Woolley wrote: > Howard Barina wrote: >> >> Does an NTP servers take into account it's estimated offset in serving >> time > > There seem to have been a lot of questions asked in the last month that > are based on the false assumption that "offset" measures the difference > between the local clock and true time. Has someone published a > misleading document, somewhere? > >> to others? If I am a server and think I am 1.5 milliseconds off from >> true >> time, will I include this in the timestamps of my ntp replies to others? > > An NTP client never thinks that its time is wrong. If it did, it would > be admitting that the NTP algorithms are wrong. Therefore the server > always serves its client's idea of the time. > > The "offset" should always be within the statistical error from the > current measurement history (if ntpd suspects otherwise, it steps, > and/or reduces the poll interval, to try to rapidly re-acquire that > condition). Immediately after startup, there will be little history, so > quite large offsets will still be consistent with that history. > > There are people who who argue that the NTP algorithms are fundamentally > flawed and don't give the statistically best time in real world > situations. I think they have some credibility, but NTP's inventor, > does not. >
I hope you did not mean to say that David Mills has no credibility but what you wrote sure reads that way!! _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
