[ntp:questions] NTP Bug 2328 - Vista/Win7 time keeping inaccurate and erratic

Martin Burnicki martin.burnicki at meinberg.de
Thu Nov 28 13:42:52 UTC 2013

David Taylor wrote:
> I'm not sure whether we still have a route into Microsoft to get the
> adjustment quantisation fixed - it would certainly be helpful.

Indeed, and providing an API which could be used to tell Windows that a 
leap second has been scheduled would make everything perfect. ;-)

> Referring to your graphs, I took a GPS/PPS synced Raspberry Pi along to
> the downstairs network, and made Win-7/64 PC Molde take its preferred
> reference NTP server instead of an stratum-1 server over Wi-Fi.  What a
> dramatic improvement!
>    http://www.satsignal.eu/mrtg/molde_ntp-b.html
> Averaged jitter has dropped from around 3 milliseconds to just under 1
> millisecond (likely a Win-7 resolution limitation), and the offset from
> a spikey +/- 5 milliseconds to a much smaller value as can be seen from
> the graph.  Now I have to think about installing Ethernet cable
> everywhere!  <G>

That is exactly what I would have expected.

Martin Burnicki

Meinberg Funkuhren
Bad Pyrmont

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