netdev - Re: Slow speed of tcp connections in a network namespace

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Date:	Sat, 29 Dec 2012 09:40:28 -0800
From:	Eric Dumazet <erdnetdev@...il.com>
To:	Andrew Vagin <avagin@...allels.com>
Cc:	netdev@...r.kernel.org, vvs@...allels.com,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Subject: Re: Slow speed of tcp connections in a network namespace

On Sat, 2012-12-29 at 18:50 +0400, Andrew Vagin wrote:
> On Sat, Dec 29, 2012 at 05:53:23AM -0800, Eric Dumazet wrote:
> > > 3.8-rc1 is used for experiments.
> > > 
> > > Do you have any ideas where is a problem?
> > 
> > veth has absolutely no offload features
> > 
> > It needs some care...
> > 
> > At the very miminum, let TCP coalesce do its job by allowing SG
> > 
> > CC Michał Mirosław <mirq-linux@...e.qmqm.pl> for insights.
> > 
> > Please try following patch :
> 
> Hello Eric,
> 
> Thanks for your feedback.
> 
> With this patch the results is a bit better (~4MB/s), but it's much less
> than in the root netns.

Please post your new tcpdump then ;)

also post "netstat -s" from root and test ns after your wgets



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