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From: "joseph kacmarcik" <joe-freebsd-questions@chubbo.net>
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Subject: Can't see second CPU in FreeBSD 5.4-p6
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hello's!

i've recently installed freebsd 5.4 and patched up to p6. since the
install and up to this patch level, i'm not certain the second cpu
(hyperthreading, not physical cpu) is being used. i guess it could just be
top not showing it, cuz it's in my kernel and in dmesg.

relevant kernel lines are:
options         SCHED_4BSD
options         SMP
device          apic

and relevant dmesg output is:
CPU: Intel(R) Pentium(R) 4 CPU 2.80GHz (2795.24-MHz 686-class CPU)
  Hyperthreading: 2 logical CPUs
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
SMP: AP CPU #1 Launched!


when using top, i always see CPU0, and the column under 'C' is always 0.

is there another tool i can use to see cpu scheduling or am i missing
something obvious (or obscure)?

for the record, i've tried more than one cpu, and freebsd 5.2.1 was able
to see and use two cpu's with the same hardware.

insight appreciated!
joe