linux-kernel - Re: [PATCH] irq: Add node_affinity CPU masks for smarter irqbalance hints

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Message-ID: <20091125103713.GF29096@one.firstfloor.org>
Date:	Wed, 25 Nov 2009 11:37:13 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>,
	peter.p.waskiewicz.jr@...el.com, peterz@...radead.org,
	arjan@...ux.intel.com, yong.zhang0@...il.com,
	linux-kernel@...r.kernel.org, arjan@...ux.jf.intel.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] irq: Add node_affinity CPU masks for smarter irqbalance hints

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

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