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

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Date:	Tue, 24 Nov 2009 21:46:28 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	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

Andi Kleen a écrit :
> 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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