[ntp:questions] Re: info on use by NTP of CPU cycle counters etc

Ulrich Windl Ulrich.Windl at RZ.Uni-Regensburg.DE
Thu Aug 28 06:55:05 UTC 2003

The "nanokernel" documentation should elaborate on that. However I had
to find out myself what the semantics of the routines are or most
likely should be.


"David Schwartz" <davids at webmaster.com> writes:

> "Drk Ryan" <ryandrk at hotmail.com> wrote in message
> news:de98eac0.0308251228.2ef52f28 at posting.google.com...
> > >Besides the time quantity that is incremented every timer interrupt
> > >there are some hardware facilities to help to interpolate the time
> > >between individual interrupts. For Linux 2.0 Pentium or better use
> > > the
> > >processor's cycle counter for a very fine resolution (below 1
> > >microsecond), while other CPU's on arch i386 use the registers of the
> > >timer chip that generates periodic interrupts.
> > Is this information (explaining  the interpolation of interrupts and
> > reading of the CPU cycle counter etc.) available in any of the NTP
> > documentation?
>     I wouldn't think so since NTP itself doesn't do this.
>     DS

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