netdev - Re: SACK scoreboard

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Message-Id: <20080108.224144.234253941.davem@davemloft.net>
Date:	Tue, 08 Jan 2008 22:41:44 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jheffner@....edu
Cc:	andi@...stfloor.org, ilpo.jarvinen@...sinki.fi,
	lachlan.andrew@...il.com, netdev@...r.kernel.org,
	quetchen@...tech.edu
Subject: Re: SACK scoreboard

From: John Heffner <jheffner@....edu>
Date: Tue, 08 Jan 2008 23:27:08 -0500

> I also wonder how much of a problem this is (for now, with window sizes 
> of order 10000 packets.  My understanding is that the biggest problems 
> arise from O(N^2) time for recovery because every ack was expensive. 
> Have current tests shown the final ack to be a major source of problems?

Yes, several people have reported this.

It's a real issue, and it's only going to get worse.
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