Re: [chrony-users] A real-life example of chrony on a LAN

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On Fri, May 11, 2018 at 11:18:43PM -0700, Stephen Satchell wrote:
> I've not yet attempted to figure out how to measure the delta between the
> two firewall boxes, and the two desktop boxes.

That will probably require directly connected NICs with HW
timestamping and/or each machine having a PPS refclock.

> For my purposes, the clocks are "close enough".  It's interesting, though,
> that the chronyd services on the two client boxes both prefer the chronyd
> source over the old NTP source.

That's most likely due to a smaller root dispersion reported by the
chronyd server. ntpd by default increases the dispersion by 15 ppm.
In chronyd it depends on collected statistics and it is usually
smaller than 15 ppm. The minimum dispersion rate can be configured
with the maxclockerror option.

Miroslav Lichvar

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