From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hannes Frederic Sowa <hannes@stressinduktion.org>
Subject: Re: Poor TCP bandwidth between network namespaces
Date: Mon, 4 Feb 2013 23:52:27 +0100
Message-ID: <20130204225227.GC6898@order.stressinduktion.org>
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Cc: netdev@vger.kernel.org
To: Emmanuel Jeanvoine <emmanuel.jeanvoine@inria.fr>
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On Mon, Feb 04, 2013 at 03:43:20PM +0100, Emmanuel Jeanvoine wrote:
> I'm wondering why the overhead is so high when performing TCP 
> transfers between two network namespaces. Do you have any idea about 
> this issue? And possibly, how to increase the bandwidth (without 
> modifying the MTU on the veths) between network namespaces?

You could try Eric's patch (already in net-next) and have a look at the rest
of the discussion:

http://article.gmane.org/gmane.linux.network/253589