[ntp:questions] Win7: ntpd adjusting time backwards

Jeroen Mostert jmostert at xs4all.nl
Mon Dec 10 21:34:03 UTC 2012

On 2012-12-10 22:18, 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.

OK. Well, that's too bad, I guess.

Throw me a bone here, fellas. It's nice to know something is wrong, but if all I 
can see is that all peers consistently report offsets in this range, the best I 
can conclude is that either ntpd simply isn't successful in disciplining the 
clock appropriately, or there is some network problem going on that someone who 
understands the NTP protocol could probably diagnose. That someone would not yet 
be me.

If I offset the offsets (pardon my math) by -33 milliseconds, I'd roughly have a 
zero axis that they'd be swinging around with a range of -10/+10. According to 
unruh, even that would still be horrible in terms of accuracy, so I'm not sure 
if that's fair in its simplicity.


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