[ntp:questions] Windows and Wi-Fi - starts well, frequency steps?

unruh unruh at invalid.ca
Mon Dec 26 06:24:52 UTC 2011


On 2011-12-26, David J Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
>
> "unruh" <unruh at invalid.ca> wrote in message 
> news:OLMJq.5774$SG3.2296 at newsfe11.iad...
> []
>> ntpd does NOT take a long term veiw. The decision made in designing it
>> wasw that it would be a short term Markovian feedback loop. It does not
>> have any memory If the offset is positive speed up the clock, if
>> negative, slow it down.
>>
>> If you want a program with a different design philosophy, get chrony. It
>> remembers up to 64 of the last measurements and uses them to determine
>> what the best estmate is of the actual offset and rate error in the
>> local clock is. (It uses linear regression, corrects past measurements
>> for current offset and rate changes, and tests to make sure that a
>> linear fit is a good estimate, decreasing the number of remembered items 
>> if it is
>> not.)
>
> I would be interested to try a Windows port of chrony, if it can be 
> managed at least to the extent of obtaining the offset with an SNMP call, 
> or a simple program.  My present monitoring uses a Perl script to parse 
> the output of an "ntpq -c rv" request.

Unfortunately no windows port exists. Linux, BSD only for now. 


>
> Cheers,
> David 
>



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