[ntp:questions] ntpdate function

David Woolley david at ex.djwhome.demon.invalid
Thu Apr 11 07:00:17 UTC 2013


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> Jacek Igalson wrote:
> 
>> 2. ntpdate can be used with option -p, 1 to 8 sampling.
>>    Difference of delay is 0.05586 sec to 0.05359 sec.
>>    Result from ntpq is 28 msec.
>>    To big to be a statistical explanation

That would be consistent with a factor of two, not a fixed offset.  Cold 
it be that ntpdate is reporting round trip delay, whereas ntpq is 
reporting the delay figure actually used to correct for time of flight, 
which is half that?


>  ICMP echo may have a lower priority than NTP;
> 

ICMP echo is likely to be handled by the interrupt service routine, with 
no process scheduling delays.



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