selection of .GPS.

Gary E. Miller gem at
Sun Jul 29 20:17:09 UTC 2018

Yo Paul!

On Sun, 29 Jul 2018 12:58:12 -0700
Paul Theodoropoulos <paul at> wrote:

> Something I'm still unclear on - my ntpsec server is happily rolling 
> along with kernel PPS. Dandy. The GPS signal (fudged as close as I
> can get it) offset and jitter vacillate wildly, which from
> experience, is pretty much 'normal'.

These is why committees best have an odd number of members.  Trying
to decide which of two clocks is 'better' is hard.  Flip a coin?

Best thing is to NOT fudge your GPS to be close.  Then other remote
time sources will help vote it out.

Some suggest setting the GPS fudge to be 10 ms off of PPS.  For similar

You can set the GPS to "noselect", but then you lose it as a fall back
if all other sources fail.

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

	    Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin
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