netdev - Re: [net-next PATCH v4 1/3] net: TCP thin-stream detection

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Message-ID: <4B82A566.5000600@simula.no>
Date:	Mon, 22 Feb 2010 16:40:22 +0100
From:	Andreas Petlund <apetlund@...ula.no>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Lars Eggert <lars.eggert@...ia.com>,
	David Miller <davem@...emloft.net>,
	"zimmermann@...s.rwth-aachen.de" <zimmermann@...s.rwth-aachen.de>,
	"pavel@....cz" <pavel@....cz>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"ilpo.jarvinen@...sinki.fi" <ilpo.jarvinen@...sinki.fi>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"Arnd.Hannemann@...s.rwth-aachen.de" 
	<Arnd.Hannemann@...s.rwth-aachen.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"shemminger@...tta.com" <shemminger@...tta.com>,
	"william.allen.simpson@...il.com" <william.allen.simpson@...il.com>,
	"damian@....rwth-aachen.de" <damian@....rwth-aachen.de>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>
Subject: Re: [net-next PATCH v4 1/3] net: TCP thin-stream detection

On 22. feb. 2010 16:17, Andi Kleen wrote:
> Lars Eggert <lars.eggert@...ia.com> writes:
> 
>> If it's off by default there is no issue.
> 
> Still a sufficient large number of people might turn it on
> and then the network would melt.
> 
> IMHO TCP changes with badly understood congestion behaviour
> should not be merged until the necessary analysis/simulation etc.
> is done.
> 
> -Andi

Graphs from our experiments can be found here:
http://simula.no/research/nd/publications/Simula.nd.477/simula_pdf_file

Section 5.2.5 covers experiments on fairness-issues. We have found no
adverse effects of the modifications submitted in this patch set (mFR
and LT in the plot), but further testing cannot hurt.

Best regards,
Andreas
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