netdev - A question about Forward ACKed packets

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Date:	Wed, 1 Jun 2011 00:09:40 +0200
From:	Dominik Kaspar <dokaspar.ietf@...il.com>
To:	netdev@...r.kernel.org
Subject: A question about Forward ACKed packets

Hi,

I'm trying to understand the concept of Forward Acknowledgements
(FACK). What confuses me most is the variable fackets_out, which,
according to the source code, is equal to the "FACK'd packets".

Isn't by definition only a single packet "the most Forward ACKed
packet"...? If not, what are "FACK'd packets"? Is fackets_out the
number of "gaps" between SACKed data?

Greetings,
Dominik
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