Dave Hart wrote: [] > The 150us offsets are while slewing to try to catch up with the 3ppm > frequency shift as the heat comes on. I have to imagine a Windows PC > with a more stable oscillator (lower temperature coefficient to > frequency) would do better, though I'm not deluding myself that it > would match the performance of FreeBSD, with its advantage of knowing > the precise relationship between the counter and the system clock.
Yes, it would be nice to have a more stable crystal in that system. Agreed on the comparison with FreeBSD. Isn't there an NTP simulator where someone could model jitter and offset against a 2.5ppm sinusoidal or triangular frequency swing? > I have no familiarity with 4.2.0 but keep in mind it's even older than > 2005, that's the FreeBSD release date and they were not keeping up wth > NTPv4 builds very closely then. From my perspective comparing its > performance to the new Windows stuff, it would be awfully nice to get > 4.2.4p6 on your FreeBSD box. There are plenty of helpful FreeBSD > wizards hanging around here who could help with any issues you have > building the reference implementation and installing it in place of > the system-provided one on that FreeBSD box. At least I think they > would, but given your treacherous discussion of moving away from > FreeBSD in favor of Windows maybe you'd get the cold shoulder ;) Yes, it would be most interesting to know whether 4.2.2p6 has traded offset for the sake of jitter. I don't propose to make any changes on a working box right now, though. >> I have checked for a temperature monitoring SNMP plug-in, but not >> found a compatible one as yet. > > SNMP is ideal, but anything that could read a temperature that had a > high degree of correlation with your osciallator's crystal temperature > would be enough to build upon. I'm afraid anything built in to your > hardware (like CPU core temp) is not well-enough correlated the > crystal temp. > > Cheers, > Dave Hart I'm happy to play if anyone knows anything for a Dell 4400. It needs to have an interface I can read - either via SNMP or a Perl script so that I can get it into MRTG to plot. Using the WMI/MSAcpi_ThermalZoneTemperature approach doesn't work, so I'm probably stuck. Cheers, David _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions