[ntp:questions] NTP on Windows Vista

David Woolley david at ex.djwhome.demon.co.uk.invalid
Fri Jun 20 07:22:42 UTC 2008


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.




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