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Date: Wed, 25 Nov 2009 11:37:13 +0100
From: Andi Kleen <andi@firstfloor.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>, David Miller <davem@davemloft.net>,
       peter.p.waskiewicz.jr@intel.com, peterz@infradead.org,
       arjan@linux.intel.com, yong.zhang0@gmail.com,
       linux-kernel@vger.kernel.org, arjan@linux.jf.intel.com,
       netdev@vger.kernel.org
Subject: Re: [PATCH] irq: Add node_affinity CPU masks for smarter irqbalance hints
Message-ID: <20091125103713.GF29096@one.firstfloor.org>
References: <20091124.093956.247147202.davem@davemloft.net> <1259085412.2631.48.camel@ppwaskie-mobl2> <4B0C2547.8030408@gmail.com> <20091124.105442.06273019.davem@davemloft.net> <4B0C2CCA.6030006@gmail.com> <87iqczwtia.fsf@basil.nowhere.org> <4B0C4624.9080607@gmail.com> <4B0D0742.2050301@gmail.com>
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Works here
> 
> dmesg | grep -i node
> [    0.000000] SRAT: PXM 0 -> APIC 0 -> Node 0
> [    0.000000] SRAT: PXM 0 -> APIC 1 -> Node 0
> [    0.000000] SRAT: PXM 0 -> APIC 2 -> Node 0
> [    0.000000] SRAT: PXM 0 -> APIC 3 -> Node 0
> [    0.000000] SRAT: PXM 0 -> APIC 4 -> Node 0
> [    0.000000] SRAT: PXM 0 -> APIC 5 -> Node 0
> [    0.000000] SRAT: PXM 0 -> APIC 6 -> Node 0
> [    0.000000] SRAT: PXM 0 -> APIC 7 -> Node 0

You seem to only have 8 CPUs (one socket) Normally a dual socket nehalem
should have 16 with HyperThreading enabled.

For some reason the BIOS is not reporting the other CPU.

You could double check with acpidmp / iasl -d if that's
what the BIOS really reports, but normally it should work.

> [    0.000000] SRAT: Node 0 PXM 0 0-e0000000
> [    0.000000] SRAT: Node 0 PXM 0 100000000-220000000
> [    0.000000] SRAT: Node 1 PXM 1 220000000-420000000

-Andi