netdev - Re: TSO not 10G friendly if peer is close enough

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Message-Id: <20120417.174759.327568768780440362.davem@davemloft.net>
Date:	Tue, 17 Apr 2012 17:47:59 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	alexander.h.duyck@...el.com, jeffrey.t.kirsher@...el.com,
	donald.c.skidmore@...el.com, gregory.v.rose@...el.com,
	john.r.fastabend@...el.com, jesse.brandeburg@...el.com,
	netdev@...r.kernel.org
Subject: Re: TSO not 10G friendly if peer is close enough

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 17 Apr 2012 23:38:42 +0200

> Hmm... maybe tcp_trim_head should not trim but only update an offset in
> skb... With some luck, offset can reach skb->len when all data is
> ACKnowledged...

This is definitely the way to fix this.  Just essentially defer all
the page operations until later when the entire SKB is consumed.
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