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Date:      Tue, 20 Aug 2002 17:27:25 -0500
From:      Dan Nelson <dnelson@allantgroup.com>
To:        Lord Raiden <raiden23@netzero.net>
Cc:        FreeBSD Questions <freebsd-questions@FreeBSD.ORG>
Subject:   Re: Freebsd and multi-cpu systems
Message-ID:  <20020820222725.GE70340@dan.emsphone.com>
In-Reply-To: <4.2.0.58.20020820182847.00a02280@192.168.0.25>
References:  <4.2.0.58.20020820182847.00a02280@192.168.0.25>

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In the last episode (Aug 20), Lord Raiden said:
> 	Hi all.  Just wondering about something.  I had someone today who 
> mentioned to me about doing a Freebsd server with dual P3's and a huge raid 
> array.  The raid I'm cool with.  The Dual P3's I'm not.  I know that 
> there's something special that goes into making Freebsd work correctly on a 
> multi-cpu system and make it work correctly.
> 
> 	Can anyone tell me how to do this or point me towards a faq on how 
> 	this is done?  Thanks.  I'm sure it involves some kernel hacking and 
> recompiling, so I'm game for that if need be.

Just add

options      SMP                  # Symmetric MultiProcessor Kernel
options      APIC_IO              # Symmetric (APIC) I/O

to your kernel and rebuild.  The resulting kernel will only boot on SMP
hardware, though, so don't try and boot it on a regular desktop.

-- 
	Dan Nelson
	dnelson@allantgroup.com

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