Date: Fri, 02 Sep 2005 17:25:24 +1200 From: Nigel Wohlers <lists@eyede.com> Cc: freebsd-questions@freebsd.org Subject: Re: Can't see second CPU in FreeBSD 5.4-p6 Message-ID: <4317E244.70304@eyede.com> In-Reply-To: <4716.69.181.230.113.1125637584.squirrel@69.181.230.113> References: <4716.69.181.230.113.1125637584.squirrel@69.181.230.113>
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joseph kacmarcik wrote:
> 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
Hyperbollocks is disabled by default.
See /usr/src/UPDATING entry for 20050513:
Intel Hyper-Threading is now disabled by default due to a
security issue, but can be re-enabled by setting the
machdep.hyperthreading_allowed tunable in /boot/loader.conf.
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