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

[ Thread Index | Date Index | More Archives ]

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

To unsubscribe email chrony-users-request@xxxxxxxxxxxxxxxxxxxx 
with "unsubscribe" in the subject.
For help email chrony-users-request@xxxxxxxxxxxxxxxxxxxx 
with "help" in the subject.
Trouble?  Email listmaster@xxxxxxxxxxxxxxxxxxxx.

Mail converted by MHonArc 2.6.19+