Eyeballing it says around a couple of milliseconds, which, unless
you have done things to your hardware, is lost in the NTP noise.

That was my conclusion too. It's one thing to work with hardware
at the micro- nano- or picosecond level. But the threshold with
PC's, even PC's running NTP, is so relaxed that I figured almost
any hack that uses a dut1 database would do the trick. The one
I usually fetch is http://maia.usno.navy.mil/ser7/ser7.dat.

Yesterday DUT1 was -0.30806, today is -0.30862, and tomorrow
will be -0.30937. So it seems to me you could implement the
google ntp server lie() function with essentially one line of code
and it would be accurate to better than 1 ms. No interpolation,
no filtering, no prediction; just a table lookup. Hard to beat that
performance/simplicity ratio.

/tvb

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