Yo Sanjeev! On Tue, 26 Nov 2019 07:15:30 +0800 Sanjeev Gupta via devel <devel@ntpsec.org> wrote:
> The _GPSD_ man page suggests setting minpoll and maxpoll to 4.
I can find no such statement. Can you locate that for me?
gpsd-time-service-howto.html says:
"ntpd seems to better use a PPS refclock when the polling interval is
as small as possible. The ntpd default minpoll is 6, and can be set to
as low as 4. NTPsec versions 0.9.5 and above of ntpd allow you to
set minpoll and maxpoll as low as 0. Changing minpoll from 4 to 3, 2, 1
or maybe even a,0 may reduce your PPS jitter by over a factor of 4."
"It change may require several hours for ntpd to converge with the new
settings. Use ntpviz to find the best poll interval for your system."
"The value that yields the lowest jitter may not be the one that yields
the best Local Clock Frequency Offset."
My testing shows 3 or 4 works best, depending on many factors.
RGDS
GARY
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