Message-ID: <4B0C4624.9080607@gmail.com>
Date: Tue, 24 Nov 2009 21:46:28 +0100
From: Eric Dumazet <eric.dumazet@gmail.com>
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To: Andi Kleen <andi@firstfloor.org>
CC: 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
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Andi Kleen a ?crit :
> They are typically allocated with dma_alloc_coherent(), which does
> allocate a continuous area.  In theory you could do interleaving
> with IOMMus, but just putting it on the same node as the device
> is probably better.

There are two parts, biggest one allocated with vmalloc()
(to hold struct ixgbe_rx_buffer array, 32 bytes or more per entry),
only used by driver (not adapter)

and one allocated with pci_alloc_consistent() 
(to hold ixgbe_adv_tx_desc array, 16 bytes per entry)

vmalloc() one could be spreaded on many nodes.
I am not speaking about the pci_alloc_consistent() one :)


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