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Date: Sun, 24 Feb 2008 15:59:49 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Tigger <tigger@lvlworld.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Dual core CPU's, but only 2 CPU's in-use?
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Tigger wrote:
> On Sun, 24 Feb 2008 12:46:23 +0100
> Dominic Fandrey <kamikaze@bsdforen.de> wrote:
> 
>> Tigger wrote:
>>> Hello. I have a Xeon system with 2 CPU's installed (dual-cores).
>>> Under FreeBSD 6.2, a systat reported 4 CPUs in use and so did
>>> dmesg. 
>>>
>>> Under FreeBSD 6.3, dmesg is reporting the 4 CPUs, but systat is only
>>> reporting 2 CPUs (CPU 0 and CPU 2). 
>>>
>>> How do I enabled the second cores on the CPU's or are they really
>>> running but systat is not reporting the CPU load across the cores?
>> You can run 'top -S' to check how many idle processes exist. If there
>> are four, everything is fine.
>>
> 
> 
> Sadly, no luck. Only cpu0 and cpu2 are reported:
> 
>   PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU
> COMMAND 11 root        1 171   52     0K     8K CPU2   2 143:43 92.38%
> idle: cpu2 13 root        1 171   52     0K     8K RUN    0 142:33
> 92.04% idle: cpu0

Are your CPUs really dual-core, or single core + hyperthreaded?

Kris