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From: Kirk Strauser <kirk@strauser.com>
To: freebsd-questions@freebsd.org
Date: Tue, 21 Nov 2006 06:40:05 -0600
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Subject: Disabled HTT in the kernel but not the BIOS?
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I have a dual Xeon/HTT server that I run with machdep.hyperthreading_allowe=
d=20
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, ot=
her=20
than top being unwilling to report more than 50% CPU load, are there any=20
other problems with running like this, such as the cache being split for th=
e=20
benefit of the HTT that I'm not enabling?  I can live with the cosmetic=20
glitch, but don't want to take a pointless performance hit.
=2D-=20
Kirk Strauser

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