PII SMP system hangs during boot with ACPI enabled
Nate Lawson
nate at root.org
Mon Nov 24 13:49:09 PST 2003
On Mon, 24 Nov 2003, Poul-Henning Kamp wrote:
> 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.
Some ACPI timecounters on old systems would hang on a read from the
register and so moving to i8254 would help if it was being used. But
farther down, I see that he was already using TSC so it won't make a
difference.
-Nate
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