Terje,
I put a good deal of effort in the detailed calculations, especially the
rounding issues. Even with uninterpolated 10-ms tick interval, the
results are surprisingly good. In fact, I have tested it with tinkered
1-s tick (!) and it ain't half bad.
Dave
Terje Mathisen wrote:
Martin Burnicki wrote:
Then ntpd starts to correct the initial offset properly in less than 300
seconds. This looks like it was going to converge properly. However,
unfortunately at a 10 ms offset the filter algorithm seems to switch and
the following correction is still very poor compared to the initial
correction.
Martin, the 10 ms behavior is pretty much a given, since the OS clock
works at the same 10 ms resolution!
The realtime thread hack to interpolate between OS ticks does help, but
NTPD still needs a lot of statistical data to be able to settle down at
offset values well below the OS tick!
Terje
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