[ntp:questions] Win7: ntpd adjusting time backwards

David Woolley david at ex.djwhome.demon.invalid
Tue Dec 11 21:46:29 UTC 2012


David Taylor wrote:
> On 10/12/2012 21:18, David Woolley wrote:
>> Jeroen Mostert wrote:
>>
>>>>
>>> For what it's worth, after all of that, the offset is steadily
>>> zigzagging between 27 and 41 ms, which I'm guessing is about the best
>>> you can hope for on a Windows machine with Internet sync. There have
>>> not been any major time step adjustments.
>>
>> Offsets should be scattered around zero.  If they are all the same sign,
>> something is wrong.
> 
> What happens if the link to the Internet is rather asymmetrical?  For 
> example, here I am stuck with 30 Mb/s down, but only 3 Mb/s up.

If there is an actual asymmetry in the delays (the slow uplink may have 
lower delays, because it is unloaded!), the offsets will still be spread 
across zero, but zero will not correspond to the true time.



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