Top only showing one active CPU on HTT system
Kirk Strauser
kirk at strauser.com
Tue May 24 08:53:51 PDT 2005
I'm running a 5.4-STABLE system (updated as of May 16). My kernel is
basically GENERIC with a few small tweaks, like commenting out extraneous
"cpu" lines and adding "options SMP".
My problem is that although dmesg shows every sign of having launched both
logical CPUs:
$ dmesg | grep -i cpu
CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2392.05-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!
... running "top" only shows "0" in the CPU column for every task. I don't
see anything out of place in sysctl:
$ sysctl -a | grep -i hlt
machdep.cpu_idle_hlt: 1
machdep.hlt_cpus: 2
machdep.hlt_logical_cpus: 0
and /boot/loader.conf is all but empty. Honestly, I don't really know how
long this has been going on. top used to show both 0 and 1 in the C column
and I'm not exactly sure when it stopped. Any ideas?
--
Kirk Strauser
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