netdev - Re: SACK scoreboard

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Date:	Wed, 09 Jan 2008 09:56:16 -0500
From:	John Heffner <jheffner@....edu>
To:	David Miller <davem@...emloft.net>
CC:	andi@...stfloor.org, ilpo.jarvinen@...sinki.fi,
	lachlan.andrew@...il.com, netdev@...r.kernel.org,
	quetchen@...tech.edu
Subject: Re: SACK scoreboard

David Miller wrote:
> 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.

I may have missed some of this.  Does anyone have a link to some recent 
data?

   -John
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