[ntp:questions] Re: Is reachability register used in calculations?
David L. Mills
mills at udel.edu
Thu Sep 4 02:48:57 UTC 2003
Op cite the NTP project pages. Missing samples are not incorporated in
the dispersion; rather the dispersion increases at fixed rate unless a
sample appears that resets it.
Drk Ryan wrote:
> If missing samples increase the dispersion measurement.
> How are missing samples incorporated into the dispersion value?
> ryandrk at hotmail.com (Drk Ryan) wrote in message news:<de98eac0.0308310529.2be29419 at posting.google.com>...
> > Is reachability register used in calculations?
> > Or is it just used indirectly as follows:
> > It represents an 8-bit shift register indicating the success of
> > the last 8 polls to that peer. The least significant bit is the most recent. A
> > '1' indicates the poll got a reply. A '0' indicates it didn't, and therefore
> > a missing sample. --> Missing samples increase the dispersion measurement.
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