Date: Fri, 28 Sep 2007 01:11:49 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Claus Guttesen <kometen@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: 8-core server Message-ID: <20070928081149.GA16874@eos.sc1.parodius.com> In-Reply-To: <b41c75520709280103ied4e99dvfd33884185792a91@mail.gmail.com> References: <b41c75520709280103ied4e99dvfd33884185792a91@mail.gmail.com>
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On Fri, Sep 28, 2007 at 10:03:15AM +0200, Claus Guttesen wrote:
> Upgraded our 4-core to an 8-core.
>
> Part of dmesg:
>
> FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
> cpu0 (BSP): APIC ID: 0
> cpu1 (AP): APIC ID: 1
> cpu2 (AP): APIC ID: 2
> cpu3 (AP): APIC ID: 3
> cpu4 (AP): APIC ID: 4
> cpu5 (AP): APIC ID: 5
> cpu6 (AP): APIC ID: 6
> cpu7 (AP): APIC ID: 7
>
> But then it says:
>
> SMP: AP CPU #1 Launched!
> SMP: AP CPU #2 Launched!
> SMP: AP CPU #3 Launched!
> SMP: AP CPU #4 Launched!
> SMP: AP CPU #7 Launched!
> SMP: AP CPU #5 Launched!
> SMP: AP CPU #6 Launched!
>
> Are some of the cores disabled or did they just take a walk? :-) This
> is on current from Mon Sep 24 2007.
So what's the problem? I see 7 additional processors launched ("SMP: AP
CPU #[1-7] Launched!"), while CPU #0 is the base processor, so it never
shows that message. That makes 8.
Example from my dual-core system at home:
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
SMP: AP CPU #1 Launched!
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |
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