Logical CPUs cannot be disabled via W3520

[Garrett Cooper]

    Someone on the forums [1] noticed that machdep.hlt_logical_cpus
was unavailable on their system, and I did some poking around and
noticed that it was as well. Should SMT logical CPUs be disable(-able)
via machdep.hlt_logical_cpus as well or is it just classic HTT based
chips?
Thanks,
-Garrett

$ sysctl machdep.
machdep.acpi_timer_freq: 3579545
machdep.enable_panic_key: 0
machdep.adjkerntz: 25200
machdep.wall_cmos_clock: 1
machdep.disable_rtc_set: 0
machdep.acpi_root: 1029056
machdep.disable_mtrrs: 0
machdep.idle: acpi
machdep.idle_available: spin, mwait, mwait_hlt, hlt, acpi,
machdep.hlt_cpus: 0
machdep.prot_fault_translation: 0
machdep.panic_on_nmi: 1
machdep.kdb_on_nmi: 1
machdep.tsc_freq: 2694121808
machdep.i8254_freq: 1193182
$ sysctl hw.machine hw.model
hw.machine: amd64
hw.model: Intel(R) Xeon(R) CPU           W3520  @ 2.67GHz

dmesg snippet:

CPU: Intel(R) Xeon(R) CPU           W3520  @ 2.67GHz (2694.12-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x106a5  Family = 6  Model = 1a  Stepping = 5
  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>
  Features2=0x9ce3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,SSE4.2,POPCNT>
  AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant
real memory  = 12884901888 (12288 MB)
avail memory = 12379992064 (11806 MB)
ACPI APIC Table: <091109 APIC2100>
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s) x 2 SMT threads
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
 cpu4 (AP): APIC ID:  4
 cpu5 (AP): APIC ID:  5
 cpu6 (AP): APIC ID:  6
 cpu7 (AP): APIC ID:  7

[1] http://forums.freebsd.org/showthread.php?t=12527