[ntp:questions] 2xGPS and 4x peers setup - disturbed by 5th and 6th peer

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Tue Nov 4 20:16:28 UTC 2014


Martin Burnicki wrote:
> BlackLists wrote:
>> Martin Burnicki wrote:
>>> asymmetry in the packet delay, so from the Linux client's
>>>  point of view all 4 LANTIMEs in the remote locations seemed
>>>  to have a time offset in the same range, a few milliseconds,
>>>   compared to the 2 local LANTIME.
...
>>>   that the weight put on different criteria
>>>   in the selection algorithm has changed over versions,
>>>   and the newer versions of ntpd act more like you'd expect.
>>
>> TOS MinDist affects this.
>>
>> e.g. in the case of serial nema and pps, sometimes the mindist
>>   needs to be increased from 1ms to perhaps 20ms,
>>   and I've seen as much as 400ms (fairly often);
>>   {which makes me wonder if the PPS is inverted?}
>
> I know, but you have misunderstood.

I understood fine.

My point was, increasing the mindist could create a different outcome,
 that includes the two that would have otherwise been marked false tickers;
  they may not have been chosen as sys peer,
   but would likely make it into the cluster.

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