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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] tcp: avoid wakeups for pure ACK
Date: Wed, 27 Feb 2013 16:15:52 -0500 (EST)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 27 Feb 2013 10:17:39 -0800

> So this patch will also help this (not very usual) situation, as we will
> only wakeup the tcp_sendmsg() thread when ACK is processed from softirq
> handler, and let the thread blocked in tcp_recvmsg() sleeping.

Ok, thanks for the analysis.