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
--
Martin Burnicki

Meinberg Funkuhren
Bad Pyrmont
Germany

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