precision in a driver - NTP

This is a discussion on precision in a driver - NTP ; Hi, The precision-field set by a driver, what should one set there? If a clock gives ms values, -10? Or is it the real quality of the time-source? Like: maybe that on average the source has a quality of 10ms. ...

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Thread: precision in a driver

  1. precision in a driver

    Hi,

    The precision-field set by a driver, what should one set there? If a
    clock gives ms values, -10? Or is it the real quality of the
    time-source? Like: maybe that on average the source has a quality of
    10ms.


    Folkert van Heusden

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  2. Re: precision in a driver

    Folkert van Heusden wrote:
    > Hi,
    >
    > The precision-field set by a driver, what should one set there? If a
    > clock gives ms values, -10? Or is it the real quality of the
    > time-source? Like: maybe that on average the source has a quality of
    > 10ms.
    >
    >
    > Folkert van Heusden
    >


    The precision is the smallest possible difference between two
    consecutive requests for the time! It's specified as a negative power
    of two.




  3. Re: precision in a driver

    "Richard B. Gilbert" writes:

    >Folkert van Heusden wrote:
    >> Hi,
    >>
    >> The precision-field set by a driver, what should one set there? If a
    >> clock gives ms values, -10? Or is it the real quality of the
    >> time-source? Like: maybe that on average the source has a quality of
    >> 10ms.
    >>
    >>
    >> Folkert van Heusden
    >>


    >The precision is the smallest possible difference between two
    >consecutive requests for the time! It's specified as a negative power
    >of two.


    On most systems now adays it is of the order of microseconds (-19 or -20)





  4. Re: precision in a driver

    Unruh wrote:
    > "Richard B. Gilbert" writes:
    >
    >
    >>Folkert van Heusden wrote:
    >>
    >>>Hi,
    >>>
    >>>The precision-field set by a driver, what should one set there? If a
    >>>clock gives ms values, -10? Or is it the real quality of the
    >>>time-source? Like: maybe that on average the source has a quality of
    >>>10ms.
    >>>
    >>>
    >>>Folkert van Heusden
    >>>

    >>

    >
    >>The precision is the smallest possible difference between two
    >>consecutive requests for the time! It's specified as a negative power
    >>of two.

    >
    >
    > On most systems now adays it is of the order of microseconds (-19 or -20)
    >
    >
    >
    >


    My Sun Solaris boxes report -21.

    Measure with micrometer, mark with chalk, cut with axe!


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