David J Taylor wrote: > David Woolley wrote: >> David J Taylor wrote: >>> Yesterday I undated my Windows Vista system to Service Pack 1, and >>> whilst NTP initially appeared to work correctly, it soon developed >>> an oscillating state. See: >>> >>> http://www.satsignal.eu/ntp/NTP-on-Windows-Vista.html >> They look like damped oscillations, so the questions are: >> >> - why are you getting time steps; >> - why is the response not critically damped. >> >> Can I just confirm that this system is connected to its time sources >> only by ethernet, and that that ethernet has low latency drivers? Apart >> from that one might suspect some complex power management >> feature. >> Under damping tends to indicate that ntpd is miscalculating the >> frequency correction. On Windows, the API it uses directly controls >> the software clock rate. > > Thanks for your reply, David. > > Yes, the only connections to time sources are via Ethernet, and this PC > used to be fine when it ran Windows XP with a very similar configuration. > You can see what it was like last year, before November when Vista was > installed, here: > > http://www.satsignal.eu/mrtg/gemini_ntp.html > > The ntpq output shows that it is synced to my stratum-1 server. Other PCs > work well from this same server: > > http://www.satsignal.eu/mrtg/daily_ntp.html > > According to SIW (System Information for Windows) the clock interrupts are > at 15msec intervals. As far as I know, the only power management is on > the display, which is switched off after 20 minutes. No disk power-down, > or hibernation. > > I had wondered if there was any clue in "it seemed OK immediately after > reboot", or whether that was just luck. >
Have you considered reinstalling Windows XP? _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
