[ntp:questions] Re: announce: PPSkit-2.1.2 for Linux 2.4.21

Ulrich Windl Ulrich.Windl at RZ.Uni-Regensburg.DE
Thu Sep 4 13:20:08 UTC 2003

OK, who has free APIC documentation?


Terje Mathisen <terje.mathisen at hda.hydro.com> writes:

> Piotr Trojanek wrote:
> > In article <m37k4qmhh9.fsf at pc5234.rz.uni-regensburg.de>, Ulrich Windl wrote:
> >
> >>I would like to have any feedback regarding architectures other than
> >>ia32/Pentium.  The download can be found on up-to-date Linux mirrors
> >>in /pub/linux/daemons/ntp/PPS as PPSkit-2.1.2.tar.gz (or bz2). The
> >>size is about 125kB.
> > What are the reasons Linux use TSC for PPS timestamping, while
> > FreeBSD-5.1-RELEASE use ACPI (by default)? -- I don't say ACPI is
> > better, just asking.
> >
> TSC is mostly useless on SMP machines unfortunatly, unless you can pin
> your process, including all PPS interrupt handlers, to a single CPU.
> Terje
> -- 
> - <Terje.Mathisen at hda.hydro.com>
> "almost all programming can be viewed as an exercise in caching"

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