Unruh wrote: [] > OK, I keep forgetting. What accuracy can the clock be read on windows? > is there an interpolation routine in the kernel so the clock can be > read > to usec accuracy? > I would thin k you could set up and interrupt routine to read and > record > the clock time when the interrupt occurs.
Bill, - with operating system calls, the main clock can be read with a precision of 1 millisecond (although the ticks may be only 15 milliseconds). There are higher resolution counters which can also be read. - yes, for NTP's internal use there is an interpolation routine, recently updated by Dave Hart. - yes, Dave Hart has a modified device driver which records the time in kernel mode, rather than the more usual user-mode timestamping. On my main stratum-1 PC, this reduced the jitter reported by NTP (and averaged) from around 5 microseconds to around 2.2 microseconds. Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
