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

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Message-ID: <4B0C2CCA.6030006@gmail.com>
Date:	Tue, 24 Nov 2009 19:58:18 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
CC:	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

David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Tue, 24 Nov 2009 19:26:15 +0100
> 
>> It seems complex to me, maybe optimal thing would be to use a NUMA policy to
>> spread vmalloc() allocations to all nodes to get a good bandwidth...
> 
> vmalloc() and sk_buff's don't currently mix and I really don't see us
> every allowing them to :-)

I think Peter was referring to tx/rx rings buffers, not sk_buffs.

They (ring buffers) are allocated with vmalloc() at driver init time.

And Tom pointed out that our rx sk_buff allocation should be using the node
of requester, no need to hardcode node number per rx queue (or per device as of today)


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