Re: [chrony-users] Why doesn't chrony provide a "maximum error" like ntpd does?

[Miroslav Lichvar <mlichvar@xxxxxxxxxx>]

On Mon, Jan 22, 2018 at 09:12:17PM -0800, Bill Unruh wrote:
> > > I'm not sure which "maximum error" do you mean. chrony provides root
> > > dispersion and root delay in the chronyc tracking report, similarly to
> > > the ntpq readvar command.
> > > 
> > 
> > Thanks, Miroslav:-)
> > 
> > By the way, by "maximum error", I mean the maximum uncertainty of the
> > local system time, or the maximum error between local system time and
> > the time server's system time:-)
> 
> Sounds like it basically the roundtrip-time/2 +max uncert in the server
> time. Not that that is a terribly useful number.

That would be the root distance (root delay/2 + root dispersion).

There is also a "maximum error" field in the timex structure returned
by the ntp_adjtime()/adjtimex() call, which includes a 500ppm drift
and is set by chronyd on each clock update, similarly to ntpd.

-- 
Miroslav Lichvar

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