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

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Message-ID: <20100221221829.GX2659@nuttenaction>
Date:	Sun, 21 Feb 2010 23:18:29 +0100
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Pavel Machek <pavel@....cz>
Cc:	Andreas Petlund <apetlund@...ula.no>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ilpo J?rvinen <ilpo.jarvinen@...sinki.fi>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Arnd Hannemann <hannemann@...s.rwth-aachen.de>,
	LKML <linux-kernel@...r.kernel.org>, shemminger@...tta.com,
	David Miller <davem@...emloft.net>,
	william.allen.simpson@...il.com, damian@....rwth-aachen.de,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [net-next PATCH v4 1/3] net: TCP thin-stream detection

* Pavel Machek | 2010-02-21 11:21:03 [+0100]:

>> +1) If the stream is thin, fast retransmit on the first dupACK.
>> +2) If the stream is thin, do not apply exponential backoff.
>
>2) seems very dangerous/unfair. If network  congestion is caused just
>by thin streams, will the network just fall apart?

I question the fairness of this modification! The modification sounds _really_
far-reaching. Did you analyse the behaviour of this modification? What about
fairness analysis? Great work is available in the network simulator sector for
this kind of analysis (e.g. jain's fairness index).


HGN

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