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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