✘minpoll=maxpoll=3

[Gary E. Miller]

Yo All!

New data for poll=3 (8 Sec).

Xeon:

      Local Clock      Local Clock  Local Clock    PPS         PPS      
Poll  Freq Offset 90%  Jitter 90%   Stability 90%  Offset 90%  Jitter 90%       
1           495ppb         16.9us      27.7ppt       39.0us      26.7us
2           332ppb         20.9us      15.6ppt       40.6us      29.7us
3           165ppb         20.5us       7.5ppt       34.6us      27.9us
6           570ppb         10.2us       1.2ppt       34.2us      16.3us

The above is pretty clear that for every 90% measure the best is for
poll=6, except Frequency Stability.  That is OK since the goal is to
optimize for time, not frequency.

I think the frequency shifting is due to ntpd pulling the xtal against
temp changes.

RasPi3:

      Local Clock      Local Clock  Local Clock    PPS         PPS
Poll  Freq Offset 90%  Jitter 90%   Stability 90%  Offset 90%  Jitter 90%
1          1.1ppm         0.43us       2.3ppt         1.6us     0.34us
2          1.1ppm         0.08us       2.9ppt         2.2us     0.20us
3          0.5ppm         0.18us       1.9ppt         3.0us     0.56us
6          1.4ppm         3.3us        2.2ppt        68us       9.7us

Here it is a litle less clear if poll=1 or =2 is best. poll=1 has the least
PPS Offset, but for a 30% reduction in offset, the Local Clock Jitter
reduces by over a factor of 5.  3 is getting worse and 6 is just bad.

I'll probably rerun the =1 and =2 numbers eventually, But poll=4 is
running now.  More data in a few days.


RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588
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