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From: David Miller <davem@davemloft.net>
Subject: Re: pskb_copy() in tcp_transmit_skb()
Date: Tue, 13 Sep 2011 12:34:28 -0400 (EDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 13 Sep 2011 14:02:17 +0200

> I suggest you read dev_queue_xmit_nit() : Every xmit packet can be
> cloned right here.

Right, any packet that has been sent in the past might now be
cloned.