netdev - example of tcp dsack undo

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Message-ID: <3d2301590703200856o32f21bf1g4617c5f8033ca561@mail.gmail.com>
Date:	Tue, 20 Mar 2007 10:56:46 -0500
From:	"Robert Liang" <liangrob@...il.com>
To:	netdev@...r.kernel.org
Subject: example of tcp dsack undo

Hi,

While designing some testing examples for the undo mechanisms, I found that
undo_dsack is only used when the state is Disorder. However, I assume that
dsack happens when there are retransmissions, which means Recovery or Loss.

I can think of an example of receiving dsack following a successful
recovery. But
the dsack ACKs old data and can not bring the state into Disorder.
Can anybody give me an example when *valid* dsack is received while in Disorder
state.

Thank you!

rl
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