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reasons for dev_alloc_skb +16?

To: netdev@xxxxxxxxxxx
Subject: reasons for dev_alloc_skb +16?
From: Jeff Garzik <jgarzik@xxxxxxxxx>
Date: Wed, 9 Jul 2003 11:25:53 -0400
Sender: netdev-bounce@xxxxxxxxxxx
User-agent: Mutt/1.3.28i
I knew this at one time, but have forgotten it :)

What is the reason for adding 16 to the dev_alloc_skb length?
(and skb_reserve of the same length)

        Jeff



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