https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285867

--- Comment #28 from Mark Millard <marklmi26-f...@yahoo.com> ---
(In reply to Anthony Williams from comment #27)

Looking at the 14.1R pair:
(- lines are for smp-disabled only)
(+ lines are for smp-enabled  only)

# diff -u ~/T400-14.1R-verbose-boot-smp-*.txt | grep -i CPU
 CPU: Intel(R) Core(TM)2 Duo CPU     P8400  @ 2.26GHz (2261.12-MHz K8-class
CPU)
 MADT: Found CPU APIC ID 0 ACPI ID 0: enabled
 SMP: Added CPU 0 (AP)
 MADT: Found CPU APIC ID 2 ACPI ID 2: disabled
 MADT: Found CPU APIC ID 3 ACPI ID 3: disabled
+FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
+               CPU0 (BSP): APIC ID: 0
+               CPU1 (AP): APIC ID: 1
 APIC: CPU 0 has ACPI ID 0
+APIC: CPU 1 has ACPI ID 1
 ULE: setup cpu 0
+ULE: setup cpu 1
+SMP: AP CPU #1 Launched!
+cpu1 AP:
+CPU1: local APIC error 0x40
 CPU0: local APIC error 0x40
 cpu0: <ACPI CPU> on acpi0
-ACPI: SSDT 0xFFFFF800038B1400 0002C8 (v01 PmRef  Cpu0Ist  00003000 INTL
20050624)
+ACPI: SSDT 0xFFFFF80003832C00 0002C8 (v01 PmRef  Cpu0Ist  00003000 INTL
20050624)
-ACPI: SSDT 0xFFFFF8000373F000 00087A (v01 PmRef  Cpu0Cst  00003001 INTL
20050624)
+ACPI: SSDT 0xFFFFF8000382F000 00087A (v01 PmRef  Cpu0Cst  00003001 INTL
20050624)
+cpu1: <ACPI CPU> on acpi0
+ACPI: Processor \_PR_.CPU2 (ACPI ID 2) ignored
+ACPI: Processor \_PR_.CPU3 (ACPI ID 3) ignored
 est0: <Enhanced SpeedStep Frequency Control> on cpu0
+est1: <Enhanced SpeedStep Frequency Control> on cpu1
+ACPI: Processor \_PR_.CPU2 (ACPI ID 2) ignored
+ACPI: Processor \_PR_.CPU3 (ACPI ID 3) ignored
+ACPI: Processor \_PR_.CPU2 (ACPI ID 2) ignored
+ACPI: Processor \_PR_.CPU3 (ACPI ID 3) ignored
+cpu_reset: Stopping other CPUs


CPU2 and CPU3 are never enabled. smp-enabled does have CPU1
enabled, not just CPU0.

How many FreeBSD cpus does top show for 14.1R with
smp-enabled? 2? 4? (Cross checks on the above.)

cpu1 is likely the hyper-threading on the same core as cpu0?

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