netdev - skb allocation size question

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Message-ID: <201009011151.02639.awilliams@atheros.com>
Date:	Wed, 1 Sep 2010 11:51:02 -0700
From:	Aaron Williams <awilliams@...eros.com>
To:	<netdev@...r.kernel.org>
Subject: skb allocation size question

Hi,

I have been trying to track down an issue in one of our drivers with SKB 
allocation and in my research I came across something that seems a bit 
strange. In __alloc_skb, a block for the data allocates size + sizeof(struct 
skb_shared_info) bytes, yet skb->truesize is set to size + sizeof(struct 
sk_buff). Is there a reason for this discrepancy?

-Aaron Williams
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