6.3 SMP but only one CPU detected

[rdmurray at bitdance.com]

I wrote:
> We have some systems we are upgrading from FreeBSD 6.1 to FreeBSD 6.3.
> These are Dell PowerEdge servers.  The one I'm working on now is a 1950.
> Under 6.1 it booted into SMP mode no problem.  Under 6.3, with no changes
> made in the BIOS settings, it does not.  Here is the start of the dmesg:

Turns out the problem was a third party installer that added a line that
disabled ACPI to /boot/loader.conf.

Sigh.

--David