[ntp:questions] Fwd: Using ntpdate -b SERVER shortly after SERVER boots
Richard B. gilbert
rgilbert88 at comcast.net
Tue Feb 13 17:11:33 UTC 2007
David J Taylor wrote:
> Uwe Klein wrote:
>
>>Richard B. gilbert wrote:
>
> []
>
>>>That's an interesting article but it misuses the word "precision".
>>>Precision is a property of your clock and can be thought of as the
>>>smallest possible difference in time that the clock can measure.
>>
>>isn't that "resolution" ?
>>iananes ( i am not a native english speaker ;-)
>>
>>>A clock can have a precision of 1 microsecond and still be five
>>>minutes slow!
>>>
>>
>>uwe
>
>
> Uwe,
>
> I suspect these terms mean what you choose them to mean. Here is what
> Google has to offer:
>
> http://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4SUNA_en___GB202&q=define%3a+precision
>
> (includes both "number of digits" and "degree of refinement")
>
> http://www.google.com/search?hl=en&rlz=1T4SUNA_en___GB202&q=define%3A+resolution&btnG=Search
>
> (includes "measure of accuracy or dynamic range of an A/D or D/A
> converter" and "smallest quantity that can be measured").
>
> From this, I would suggest:
>
> precision - degree of correctness
>
> resolution - accuracy of measurement
>
> Perhaps NTP has its own definitions?
Indeed it does! See RFC-1305 page 11.
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