[ntp:questions] strange behaviour of ntp peerstats entries.

David L. Mills mills at udel.edu
Sun Feb 3 04:58:44 UTC 2008


Can we take a time out? Can you read the NTPv4 specification where it 
describes the system process? Our disussion would be much more 
productive after that.


David Woolley wrote:
> David L. Mills wrote:
>> David,
>> I don't know what you mean by "figure head", but this is probably what 
> I meant that it is the one peer chosen to represent all the peers 
> actually used.
>> is intended. The statistics such as root delay, root dispersion and 
>> related statistics are in fact inherited from the system peer, but the 
>> actual clock offset is computed as a weighted average. See the draft 
>> MT{v4 specification.
> I believe that there is a common misconception that ntpd choses one peer 
> and then uses that as the only source of time information unless and 
> until it chooses a new one.
> I believe there is also a related one, which does have same historical 
> basis in fact, that ntpd only uses time from the lowest numbered 
> stratum.  (As I understand it version three included the stratum in the 
> weighting, but version 4 does not.)

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