netdev - [tcp-dsack] interface for retrieving dsack information

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Date:	Tue, 14 Jul 2009 20:21:58 -0400
From:	Yinglin Sun <yinglin.s@...il.com>
To:	netdev <netdev@...r.kernel.org>
Subject: [tcp-dsack] interface for retrieving dsack information

Hi,

I'm trying to count the number of unnecessary retransmissions for a
tcp connection. DSACK reports the receipt of duplicate segment to
sender, so I plan to count the duplicate transmissions reported by
DSACK as unnecessary retransmissions. My question is if there is a
nice interface, like tcp_info, which can be used for retrieving the
number of duplicate transmissions from DSACK? tcp_info structure
doesn't include such information.

Thanks a lot.

Yinglin
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