[time-nuts] clock-block any need ?

bg at lysator.liu.se bg at lysator.liu.se
Thu Dec 27 23:31:02 UTC 2012


Magnus,

> Doing ~200 us for a non-trival network with real data on it sound about
> right.
>
> What kills many assumptions is that the noise-forms fail most of the
> normal assumptions about "noise". It's not zero mean, it does not have a
> static mean, it does not have a static variance, it is not symmetric, it
> is not independent of other traffic, it is not "just another service".
>
> Cheers,
> Magnus

But NTP is very much aware of the measurements coming from a complicated
statistical source. Look for 'wedge scattergram'.

   http://www.eecis.udel.edu/~mills/database/brief/algor/algor.pdf
   http://www.eecis.udel.edu/~mills/database/brief/distlec/distlec.ppt

--

    Björn




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