[ntp:questions] NTP Performance on WINNT
David J Taylor
david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Mon Jul 20 15:51:05 UTC 2009
David J Taylor wrote:
>> And, I noticed the offset for Narvik is more stable than that for
>> Hydra, is it due the PPS feeded to Narvik? But Bacchus is doing good
>> too without PPS, Why?
> Hydra is running Windows-7. Because Windows Vista and Windows-7 may
> have a 1KHz clock, the interpolation scheme which is used with XP does
> not work correctly. So if you like to think of it this way, the
> Windows-7 system is using purely "native Windows 1KHz" timing, but the
> XP system is using "interpolated 64Hz" timing, and the guys who wrote
> and implemented that interpolation did a great job. If Narvik and Hydra
> had the same OS, I would expect similar performance.
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