[ntp:questions] FW: Clock Offset

Mischanko, Edward T Edward.Mischanko at arcelormittal.com
Sat Dec 22 20:20:01 UTC 2012


> -----Original Message-----
> From: Mischanko, Edward T
> Sent: Friday, December 21, 2012 9:14 PM
> Subject: RE: [ntp:questions] Clock Offset
> 
> 
> > -----Original Message-----
> > From: questions-
> > bounces+edward.mischanko=arcelormittal.com at lists.ntp.org
> > [mailto:questions-
> > bounces+edward.mischanko=arcelormittal.com at lists.ntp.org] On
> > Behalf Of Terje Mathisen
> > Sent: Thursday, December 20, 2012 2:42 AM
> > To: questions at lists.ntp.org
> > Subject: Re: [ntp:questions] Clock Offset
> >
> > Mischanko, Edward T wrote:
> > > No local clock is in use!!  I was really questioning how the
> > > averaging algorithm could come up with a negative offset
> when
> > none of
> > > the individual offsets were negative?
> >
> > That's (sort of) easy!
> >
> > The local clock offset is the best estimate of the
> > (exponentially afair)
> > averaging algorithm from the individual iterations of the
> > control loop,
> > while the ntpq -p gives you the last measurement from each
> > server/clock
> > source.
> >
> > I.e. they measure different things.
> >
> > Terje
> > --
> > - <Terje.Mathisen at tmsw.no>
> > "almost all programming can be viewed as an exercise in
> caching"
> >
> > _______________________________________________
> > questions mailing list
> > questions at lists.ntp.org
> > http://lists.ntp.org/listinfo/questions
[Mischanko, Edward T]

Terje,

I do not doubt you, but if they are measuring different things
to represent the same thing, then there is a formula off
somewhere?

Ed


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