netdev - Re: Socket buffer sizes with autotuning

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Message-Id: <20080516.182933.242150078.davem@davemloft.net>
Date:	Fri, 16 May 2008 18:29:33 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hkchu@...gle.com
Cc:	netdev@...r.kernel.org
Subject: Re: Socket buffer sizes with autotuning

From: "Jerry Chu" <hkchu@...gle.com>
Date: Fri, 16 May 2008 18:13:20 -0700

> The host inflight accounting gets screwed up. It looks like
> pskb_expand_head() called by tcp_tso_acked()->tcp_trim_head() messes
> up the accounting but I don't know how to fix it (still trying to
> understand this complex piece of code). There could be other reason
> as well.

This is just like freeing up a normal SKB, so decrementing the
in_flight value the appropriate number of packets should do the right
thing.

tcp_tso_acked() calculates this adjustment for you, in packets_acked.
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