netdev - Re: [PATCH] tcp: fixes for DSACK-based undo of cwnd reduction during fast recovery

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Message-Id: <20111114.152359.1131974895743731960.davem@davemloft.net>
Date:	Mon, 14 Nov 2011 15:23:59 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ncardwell@...gle.com
Cc:	netdev@...r.kernel.org, ilpo.jarvinen@...sinki.fi,
	nanditad@...gle.com, ycheng@...gle.com, therbert@...gle.com
Subject: Re: [PATCH] tcp: fixes for DSACK-based undo of cwnd reduction
 during fast recovery

From: Neal Cardwell <ncardwell@...gle.com>
Date: Tue,  8 Nov 2011 13:07:11 -0500

> (2) When the ACK field is below snd_una (the "old_ack" goto label),
> process any DSACKs and try to send out more packets based on
> newly-SACKed packets.

This seems dubious.

An older ACK should not have more uptodate SACK information than a newer
ACK.
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