netdev - Re: [PATCH] sctp: Do not account for sizeof(struct sk

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Message-ID: <20111220093910.GB21801@canuck.infradead.org>
Date:	Tue, 20 Dec 2011 04:39:10 -0500
From:	Thomas Graf <tgraf@...radead.org>
To:	Wei Yongjun <weiyj.lk@...il.com>
Cc:	vladislav.yasevich@...com, linux-sctp@...r.kernel.org,
	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] sctp: Do not account for sizeof(struct sk_buff) in
 estimated rwnd

On Tue, Dec 20, 2011 at 01:00:48PM +0800, Wei Yongjun wrote:
> I saw you discussed this with Vlad in old mail:
>     http://www.spinics.net/lists/linux-sctp/msg01365.html
> 
> You said you will update patch to include a per packet overhead,
> but it does not include in this patch, what's wrong with in?

It's not possible because upon retransmission of a chunk we need
to readd the overhead to the rwnd. There is no longer a reference
to a packet so we can't know how much to add. This explanation is
also in the original mail thread.
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