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

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Message-id: <2114B7CA-8078-4D90-BEFA-91956C58B6DA@nets.rwth-aachen.de>
Date:	Mon, 22 Feb 2010 16:35:49 +0100
From:	Alexander Zimmermann <Alexander.Zimmermann@...s.rwth-aachen.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Lars Eggert <lars.eggert@...ia.com>,
	David Miller <davem@...emloft.net>,
	"pavel@....cz" <pavel@....cz>,
	"apetlund@...ula.no" <apetlund@...ula.no>,
	"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 <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


Am 22.02.2010 um 16:17 schrieb Andi Kleen:

> 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

100% ack.

See for example here: http://www.umic-mesh.net/~zimmermann/linux.png

It's a screenshot of the ps3mediaserver. Since it's a streaming server, it's
very useful to deactivate Nagle :-)

Alex

> 
> -- 
> ak@...ux.intel.com -- Speaking for myself only.

//
// Dipl.-Inform. Alexander Zimmermann
// Department of Computer Science, Informatik 4
// RWTH Aachen University
// Ahornstr. 55, 52056 Aachen, Germany
// phone: (49-241) 80-21422, fax: (49-241) 80-22220
// email: zimmermann@...rwth-aachen.de
// web: http://www.umic-mesh.net
//

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