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Date:      Sun, 29 Dec 2002 19:51:28 -0500
From:      Jake Burkholder <jake@locore.ca>
To:        Nate Lawson <nate@root.org>
Cc:        "David O'Brien" <obrien@FreeBSD.org>, cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org
Subject:   Re: cvs commit: src/sys/kern subr_smp.c
Message-ID:  <20021229195127.I43538@locore.ca>
In-Reply-To: <Pine.BSF.4.21.0212291541200.85347-100000@root.org>; from nate@root.org on Sun, Dec 29, 2002 at 03:49:35PM -0800
References:  <20021229172453.GA50460@dragon.nuxi.com> <Pine.BSF.4.21.0212291541200.85347-100000@root.org>

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Apparently, On Sun, Dec 29, 2002 at 03:49:35PM -0800,
	Nate Lawson said words to the effect of;

> On Sun, 29 Dec 2002, David O'Brien wrote:
> > On Sat, Dec 28, 2002 at 03:53:00PM -0800, Nate Lawson wrote:
> > > On Sat, 28 Dec 2002, Jake Burkholder wrote:
> > > >   Modified files:
> > > >     sys/kern             subr_smp.c 
> > > >   Log:
> > > >   Add a tunable kern.smp.disabled for disabling explicitly smp on an smp
> > > >   kernel.
> > > >   
> > > >   Revision  Changes    Path
> > > >   1.171     +5 -1      src/sys/kern/subr_smp.c
> > > 
> > > Would love to see this go into RELENG_4 (and 5.0 for that matter).  This
> > > would aid testing.
> > 
> > That would only help Alpha wouldn't it?  We don't have the ability to
> > turn on and off SMP on i386.
> 
> It's never been possible to turn on smp after boot on FreeBSD.  This only
> disables it at boot time and should work on every platform.
> 
> I'm not sure what facility this would use on 4.x since it doesn't have
> loader tunables.  In any case, I'd like to see this in 5.0.

If you will verify that this works on x86 I will mfc it.  I have no idea if
it will work or not.

Jake

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