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

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On Thu, 4 Jun 2009, Andrew Morton wrote:

Subject: Re: only a single core (out of 8) initialized

On Thu, 4 Jun 2009 19:52:36 -0700 (PDT) david@xxxxxxx wrote:

this is 2.6.30-rc7

Were any earlier kernels OK?

 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?

this is actually the newer of the two systems. I've already escalated up to Tyan about the fact that this board won't see the Intel SSD drives (unless you hotplug the drive). I've forwarded this to them as well. their website does show a newer bios than what was shipped to me.

David Lang
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