David J Taylor wrote: > > Does anyone know an approximate relationship between polling interval > and peak-to-peak jitter for a non-ref-clock system? I.e would the > jitter offset) go up linearly with polling interval, or as the square, > or what? >
Do you mean true jitter (RMS error from true time) or the jitter statistic produced by NTP? I may be completely wrong, but I thought that true jitter initially went down with increasing polling interval and that ntpd stopped increasing the polling interval before it started to go back up again. That's because ntpd increases the loop time constant as it increases, which compensates for the increased poll interval and, in the Millsian world, measurement jitter has a 1/f spectrum. In the real world, you'll need to specify the nature of the measurement noise. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
