netdev - Re: Socket buffer sizes with autotuning

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Message-Id: <20080506.212829.213490532.davem@davemloft.net>
Date:	Tue, 06 May 2008 21:28:29 -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: Tue, 6 May 2008 20:57:46 -0700

> It may be getting a copy (e.g., when GSO is on?) hence losing all
> its connection to the original tp and any chance to have the pkt
> properly accounted for as host_infligh by TCP. The skb may also be
> cloned more than once (e.g., due to tcpdump)...

It only gets a copy if the SKB is already cloned and that clone is
alive somewhere (f.e. stuck in the device, a rare occurance by
the time we retransmit).

It is a clone %99.999999 of the time.
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