[ntp:questions] NTP Performance on WINNT
mayer at ntp.org
Wed Jul 29 02:45:22 UTC 2009
David Woolley wrote:
> Steve Kostecke wrote:
>>> I'm just not so sure if I can absolutely count on ntpq to determine
>>> time offset of NTP synced machines...
>> ntpq does not calculate anything. It merely displays information
>> returned from the ntpd it is querying.
> I believe that he means the combination of ntpq and and ntpd. The basic
> problem is that you are trying to mesure a parameter on a system where
> that parameter affects the accuracy of the measurement.
> There is also a problem that many other people believe that software
> clock time + offset = UTC time (possibly minus). However, when ntpd is
> operating in the environment in which Dave Mills expects it to operate,
> |UTC - software clock time| << |offset|.
> I believe that the parameter the OP actually wants to measure is |UTC -
> software clock time|. As this is Windows, and Windows doesn't
> interpolate, one would guess that he wants this value at the point of
> the clock tick.
Windows does interpolate, the same as Unix.
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