[ntp:questions] Timekeeping broken on Windows XP with multimedia timer enabled (-M option)

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Thu Jan 28 15:26:05 UTC 2010

David J Taylor wrote:
>> <http://plugcomputer.org/plugforum/index.php?PHPSESSID=52733b6b94aef4c469fccaabb98b52e4&topic=912.msg6855#msg6855>
>> notjeff: "I just recently setup my sheevaplug as a stratum-1 NTP server."
>> <http://tinyurl.com/yf7684o>
> Thanks, again. However: "The jitter was usually between 1 and 3 ms" is
> about a thousand times worse than I was hoping to achieve. Something to
> keep an eye on, though.

You need a real hw PPS signal to get down to single-digit us jitter, the 
only alternative is to have an expensive timing source which you can 
query and which includes the hardware to timestamp each request.

 From reading the ntpd driver sources I think the Palisade has such a mode?

- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"

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