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 Strange....
 Mine (Supermicro X5DAL-G) goes like ;

tyd3# dmesg
Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 5.1-CURRENT #30: Sun Aug 24 20:25:11 JST 2003
    ken@tyd3.sub.tydfam.jp:/usr/obj/usr/src/sys/TYD3
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0794000.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc0794294.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2799.21-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf27  Stepping = 7
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Hyperthreading: 2 logical CPUs
real memory  = 1073152000 (1023 MB)
avail memory = 1034416128 (986 MB)
Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
Programming 24 pins in IOAPIC #1
Programming 24 pins in IOAPIC #2
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
 cpu0 (BSP): apic id:  0, version: 0x00050014, at 0xfee00000
 cpu1 (AP):  apic id:  6, version: 0x00050014, at 0xfee00000
 cpu2 (AP):  apic id:  1, version: 0x00050014, at 0xfee00000
 cpu3 (AP):  apic id:  7, version: 0x00050014, at 0xfee00000
 io0 (APIC): apic id:  2, version: 0x00178020, at 0xfec00000
 io1 (APIC): apic id:  3, version: 0x00178020, at 0xfec80000
 io2 (APIC): apic id:  4, version: 0x00178020, at 0xfec80100
Pentium Pro MTRR support enabled
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <PTLTD    RSDT  > on motherboard
pcibios: BIOS version 2.10
Using $PIR table, 20 entries at 0xc00fde80
acpi0: power button is handled as a fixed feature programming model.
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
acpi_cpu0: <CPU> port 0x530-0x537 on acpi0
acpi_cpu1: <CPU> port 0x530-0x537 on acpi0
acpi_cpu2: <CPU> port 0x530-0x537 on acpi0
acpi_cpu3: <CPU> port 0x530-0x537 on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
IOAPIC #0 intpin 16 -> irq 2
IOAPIC #0 intpin 19 -> irq 5
IOAPIC #0 intpin 18 -> irq 10
IOAPIC #0 intpin 23 -> irq 11
    :           :           :

And my /etc/rc.local has;
#! /bin/sh
sysctl machdep.hlt_logical_cpus=0

And, top shows 4 CPUs are running....