netdev - Re: [PATCH net-next] net: netdev_alloc_skb() use build

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Message-ID: <1338839812.2760.1939.camel@edumazet-glaptop>
Date:	Mon, 04 Jun 2012 21:56:52 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Willy Tarreau <w@....eu>, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: netdev_alloc_skb() use build_skb()

On Mon, 2012-06-04 at 22:48 +0300, Michael S. Tsirkin wrote:

> If I do this what will truesize be? 128, no?

My example was not correct, since you must have enough room for the
SKB_DATA_ALIGN(sizeof(struct skb_shared_info))  ( 320 bytes )

So it would be 128 + 320 = 448



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