Disabled HTT in the kernel but not the BIOS?

[Kirk Strauser]

I have a dual Xeon/HTT server that I run with machdep.hyperthreading_allowed 
set to 0.  At boot, it detects 4 CPUs:

  FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
   cpu0 (BSP): APIC ID:  0
   cpu1 (AP): APIC ID:  1
   cpu2 (AP): APIC ID:  6
   cpu3 (AP): APIC ID:  7

but top confirms that only processors 0 and 2 are actually running.  So, other 
than top being unwilling to report more than 50% CPU load, are there any 
other problems with running like this, such as the cache being split for the 
benefit of the HTT that I'm not enabling?  I can live with the cosmetic 
glitch, but don't want to take a pointless performance hit.
-- 
Kirk Strauser
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-questions/attachments/20061121/e59f3e2b/attachment.pgp