Date: Sat, 14 Sep 2002 08:58:07 -0400 (EDT) From: Wesley Morgan <morganw@chemikals.org> To: Julian Elischer <julian@elischer.org> Cc: Poul-Henning Kamp <phk@critter.freebsd.dk>, Terry Lambert <tlambert2@mindspring.com>, Mark Murray <mark@grondar.za>, FreeBSD current users <current@FreeBSD.ORG> Subject: Re: A riddle in -current Message-ID: <20020914085750.V69474-100000@volatile.chemikals.org> In-Reply-To: <Pine.BSF.4.21.0209140306260.82711-100000@InterJet.elischer.org>
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99% of the time my laptop is probed with "ACPI-fast", but once or twice it
has come back with ACPI-safe. So not only is it possible to differ on
"like" hardware, but on the same machine. You might not want to pull your
hair out over that one.
On Sat, 14 Sep 2002, Julian Elischer wrote:
>
>
> On Sat, 14 Sep 2002, Poul-Henning Kamp wrote:
>
> > In message <Pine.BSF.4.21.0209140244340.82711-100000@InterJet.elischer.org>, Ju
> > lian Elischer writes:
> >
> > >the only difference I've found so far is teh following differnce in the
> > >dmesg output:
> > >21,22c21
> > >< Timecounter "ACPI-safe" frequency 3579545 Hz
> > >< unknown: I/O range not supported
> > >---
> > >> Timecounter "ACPI-fast" frequency 3579545 Hz
> >
> > You can test the difference this makes by timing
> > for (i = 0; i < 1000000; i++)
> > gettimeofday(&tv, NULL)
> >
> > ACPI-safe means that the hardware doesn't act like a properly implemented
> > binary counter (!) whereas ACPI-fast has not given any signs of having
> > trouble during the boot-time probing.
>
>
> that's interesting...
> why would they differ.... thy are the same hardware
> (serial numbers 1 apart ....) I'll have to investigate closer..
>
> >
> > --
> > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> > phk@FreeBSD.ORG | TCP/IP since RFC 956
> > FreeBSD committer | BSD since 4.3-tahoe
> > Never attribute to malice what can adequately be explained by incompetence.
> >
>
>
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