netdev - Re: [PATCH v4 net-next 0/3] tcp: better TCP_SKB

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Message-Id: <20140928.163611.307968379739374310.davem@davemloft.net>
Date:	Sun, 28 Sep 2014 16:36:11 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	edumazet@...gle.com
Cc:	netdev@...r.kernel.org, ycheng@...gle.com, ncardwell@...gle.com,
	christoph.paasch@...ouvain.be
Subject: Re: [PATCH v4 net-next 0/3] tcp: better TCP_SKB_CB layout

From: Eric Dumazet <edumazet@...gle.com>
Date: Sat, 27 Sep 2014 09:50:54 -0700

> TCP had the assumption that IPCB and IP6CB are first members of skb->cb[]
> 
> This is fine, except that IPCB/IP6CB are used in TCP for a very short time
> in input path.
> 
> What really matters for TCP stack is to get skb->next,
> TCP_SKB_CB(skb)->seq, and TCP_SKB_CB(skb)->end_seq in the same cache line.
> 
> skb that are immediately consumed do not care because whole skb->cb[] is
> hot in cpu cache, while skb that sit in wocket write queue or receive queues
> do not need TCP_SKB_CB(skb)->header at all.
> 
> This patch set implements the prereq for IPv4, IPv6, and TCP to make this
> possible. This makes TCP more efficient.

Series applied, thanks.
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