linux-kernel - Re: only a single core (out of 8) initialized

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Message-ID: <alpine.DEB.1.10.0906050946530.7953@asgard>
Date:	Fri, 5 Jun 2009 09:47:37 -0700 (PDT)
From:	david@...g.hm
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: only a single core (out of 8) initialized

On Thu, 4 Jun 2009, Andrew Morton wrote:

> On Thu, 4 Jun 2009 19:52:36 -0700 (PDT) david@...g.hm wrote:
>
>> this is 2.6.30-rc7
>
> Were any earlier kernels OK?

sorry, I missed this question.

I was running 2.6.29.1 when I noticed this problem. I haven't tried older 
kernels yet.

David Lang

>>  with a patch added to debug a nv sata driver
>> incompatibility with the Intel SSDs on a tyan motherboard
>>
>> on one system it sees all 8 cores, on the other system it only initializes
>> one core.
>>
>> can anyone help me spot what's going wrong in the one that's only seeing a
>> single core? If I'm reading things correctly it's seeing both sockets for
>> the NUMA setup, but then only initializing one core on the first socket.
>
> good:
> 	SMP: Allowing 8 CPUs, 4 hotplug CPUs
>
> bad:
> 	SMP: Allowing 1 CPUs, 0 hotplug CPUs
>
> perhaps due to
> 	ACPI: No APIC-table, disabling MPS
>
> You could have a poke around in arch/x86/kernel/smpboot.c() and find
> out what happened here.  I'd be suspecting this code triggered:
>
>        /* no processor from mptable or madt */
>        if (!num_processors)
>                num_processors = 1;
>
> because ACPI doesn't like that board.
>
> Did you look into updating the BIOS?
>
>
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