PII SMP system hangs during boot with ACPI enabled

Poul-Henning Kamp phk at phk.freebsd.dk
Mon Nov 24 13:31:04 PST 2003

In message <XFMail.20031124130939.jdp at polstra.com>, John Polstra writes:
>On 24-Nov-2003 Nate Lawson wrote:
>> It's a long shot, but what about setting kern.timecounter.hardware to
>> i8254.  It appears your ACPI timer is bad.  The reason why I suggest this
>> is that it seems like interrupts are being lost.
>I put kern.timecounter.hardware="i8254" into /boot/loader.conf, but
>it didn't make any difference.  Are you sure it even works from
>loader.conf?  From the sources it looks like this is a sysctl rather
>than a tunable.  I could change it to a tunable, though, if you
>think it's worthwhile.

It would be rather complicated to make it a tunable.  Far easier to
go into the ACPI timecounter and just give it a negative quality,
that will disable it.

I'm not sure why Nate think this will change anything with respect
to interrupts, but I pressume he knows what he's talking about.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at 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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