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Date:      Thu, 18 Jan 2001 13:28:50 -0800
From:      Lars Eggert <larse@ISI.EDU>
To:        Mike Smith <msmith@freebsd.org>
Cc:        Jamil Taylor <jamil_taylor@pobox.com>, freebsd-stable@FreeBSD.ORG
Subject:   Re: SMP & APM (was Re: SMP & signal 11)
Message-ID:  <3A676012.F919953@isi.edu>
References:  <200101182141.f0ILf2Q01268@mass.osd.bsdi.com>

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Mike Smith wrote:
> 
> > Having both the SMP options
> >
> >       options        SMP
> >       options        APIC_IO
> >
> > and APM
> >
> >       device          apm0    at nexus? # Advanced Power Management
> >
> > enabled in a kernel config file causes spurious signal 11's under
> > FreeBSD-4.2 when more than one CPU is present in the system.
> >
> > Is this a known conflict? I could not find this mentioned in related man
> > pages or LINT. (Thanks to Jamil Taylor for helping me track this down.)
> 
> It's not supported, no.  Having said that, it's theoretically *meant* to
> work, but I suspect that there are unconsidered issues which mean that
> APM and SMP just aren't going to mix.

Could this be documented somewhere? Maybe the next person to encounter this
doesn't have to spend a day tracking it down themselves... :-)

By the way, it works fine as long as there's only one CPU enabled.  
-- 
Lars Eggert <larse@isi.edu>                 Information Sciences Institute
http://www.isi.edu/larse/                University of Southern California
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