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Date:      Tue, 29 Mar 2005 03:02:02 +0400
From:      Rojer <myself@rojer.pp.ru>
To:        ulf@Alameda.net
Cc:        Greg Eden <greg@warprecords.com>
Subject:   Re: FreeBSD 5.3R SMP Kernel not detecting 2nd CPU in a HP DL360(?)
Message-ID:  <42488CEA.2020507@rojer.pp.ru>
In-Reply-To: <20050328221531.GA13841@seven.alameda.net>
References:  <b1c5f0fd4371c90fd222da400066e69e@warprecords.com> <20050328221531.GA13841@seven.alameda.net>
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[-- Attachment #1 --]
Ulf Zimmermann wrote:
> 
> I have a DL380 g3 with dual P4-3.2GHz 1MB L3 cache, the kern conf has
> just "options SMP" to make it work. Here is the top part and bottom part
> of dmesg from boot:
> ...

> 
> SMP: AP CPU #1 Launched!
> 
> ...
> 
> kern.smp.active: 1
> kern.smp.disabled: 0
> kern.smp.cpus: 2

you should see 4 cpus "launching", assuming you haven't disabled hyperthreading.

in fact, i have seen similar situation myself.
FreeBSD would not recognize second physical CPU with hyperthreading enabled.
it'd launch cpu #1 but not cpus 2 and 3.
after eventually noticing it, i tried disabling hyperthreading in BIOS -
it worked fine. i still had 2 cpus, but this time 2 physical cpus,
and lower cpu load figures confirmed that those 2 "previous" cpus were in fact
one physical + 1 hyperdreaded :)
and this is not a problem of the particular server, i actually tried replacing
the platform (moved hdds to the same box nearby) and it behaved in exactly the same manner.
the platform is Fujitsu RX200 (2 x 2.8 Xeon), OS is FreeBSD 4.11-PRERELEASE.

i still kinda have a box to play with (can bring it down to test during weekend),
so if someone can offer insight, i can provide more info and maybe even a short-term
remote ssh/serial console access.

-- 
Deomid Ryabkov aka Rojer
myself@rojer.pp.ru
rojer@sysadmins.ru
ICQ: 8025844

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