On 2019-08-14, Per Hedeland <[email protected]> wrote: > Anyway, back to the FreeBSD post, it seems there are actually two > questions: > > 1) Is the ~ 200 usec offset reported by ntpd really semi-constant (and > thus "easy to deal with")?
My understanding is that the error in the measurement is moving in an interval at a speed which depends on a hidden frequency offset. ntpd uses a median from multiple samples for controlling the clock. If the frequency offset is large enough and the polling interval long enough, the median should be stable and close to the middle of the interval. If the error is moving only very slowly, the sawtooth pattern would be visible in the offset reported by ntpd. -- Miroslav Lichvar _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
