[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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