David Lord wrote: [] > I've ntp logs going back many years and for me chrony was better > suited to handling temperature changes but was originally used > because of intermittent dialup connection.
Yes, having a history of expected variations due to temperature chnages, or perhaps even using the termperature sensors available on the PCs, might enable ntp to even better than it does now. > With ntpd and maxpoll set to a low value (8) I find ntp can > compensate ok but there is a lot of jitter and offset wanders > more than I'd like. > > With high values of maxpoll (13) I see great stability until > seasonal or other temperature changes when ntp seems to lose > the plot. > > This is no more than happens regularly anyway due to asymmetric > latency in the adsl connection. > > I'm expecting a pps source to make a massive difference. Yes, from milliseconds to microseconds - if you're lucky! > I'm using NetBSD and just had one of servers (c3-600) > disconnected from lan for a while and moved upstairs so I > could get a less erratic signal from gps/dcf/msf. I need > external aerials. I'm about 100 mile from Anthorn, 600 mile > from Frankfurt so suspect some interfering source. > > I've previously run NetBSD-1.5 on a 486dlc33, 8MB ram, and will > try to use one of my junk 486dx6, 20MB ram, as dedicated ntp box, > if I can get NetBSD-5 to install, otherwise will use one of the > servers. > > > David Here in Edinburgh I have several cheap radio-clocks, and they all seem to sync OK. Removing the CRT TVs (4th harmonic of timebase near 60KHz) probably helped. We are less than 120km from Anthorn. Rather than power-up another PC, you will probably find the performance on a shared server adequate - depending on your expectations, of course. You can run that serial lead for some distance. My page describing the hardware is here. I now have two RS232 outputs paralleled from the GPS 18 LVC. http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm Cheers, David _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions