[ntp:questions] Extracting ntpq like information programmatically

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Mon Apr 1 19:27:55 UTC 2013


Woolley wrote:> Mischanko, Edward T wrote:
>> What can be done with ntpd's code to address the lack of
>>  speed in ramping down the time constant as needed to keep
>>  up with changes in the local clock?
>
> The problem is that it only sees the effects and doesn't
>  know the cause.
>   To really speed it up, you would need to, for example,
>    monitor the temperature near the crystal, and reduce
>    the time constant if there was a sudden change.
>   However, if you had that parameter, you could also compute
>    a temperature compensation for the frequency and therefore
>    do an open loop correction.

<http://www.ijs.si/time/temp-compensation/>
<http://lx.ujf.cas.cz/ntp-lx/temp/www/>
<http://dx.eng.uiowa.edu/dave/ntptemptext.php>
...

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