[time-nuts] refclock -> NTP server settings/tuning?

Hal Murray hmurray at megapathdsl.net
Sun Sep 29 18:33:22 EDT 2013


> Each ntpd refclock has a 64 slot FIFO.  Every polling interval, ntpd
> processes the data in the buffer and turns it into a sample feed to the main
>  algorithm.  That processing discards 1/3 of the samples as (potential)
> outliers and averages the rest. 

Rats.  I left out a critical step.

Every second the shm refclock driver checks the shared memory slot for new 
data.  (I's say "polls", but that gets confused with the polling interval 
that min/maxpoll sets.)



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