Re: [chrony-users] Root delay and Root dispersion values in `chronyc ntpdata'

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

Isn't that information all there already in the "measurements" log?


William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/

On Tue, 8 Aug 2017, Horia Muntean wrote:

> On Tue, Aug 8, 2017 at 5:07 PM, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
> > Ok. I agree it could be useful.
> >
> > Do you think it would be better to write there the delay and
> > dispersion as was estimated right before the update of the clock to
> > get the maximum value of dispersion, or rather use the new values from
> > the update, assuming the user will calculate the amount of dispersion
> > that accumulated till the next update?
> >
> > --
> > Miroslav Lichvar
>
> How would one compute the estimated error of the system time from UTC
> at any point in time from information given by 'chronyc tracking' ?
> Is 'System Time' + 'Root Delay' / 2  + 'Root Dispersion' the correct formula ?
> If yes then then all these 3 values would be helpful to be put in
> tracking.log (or maybe other log) regardless
> they are before or after an update as long as they are consistent
> (they refer to the state of time from the same moment).
>
> For consistency maybe they should be the values 'chronyc tracking'
> would display after the last update.
>
> --

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