netdev - Re: Poor TCP bandwidth between network namespaces

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Message-ID: <1360376230.6696.7.camel@edumazet-glaptop>
Date:	Fri, 08 Feb 2013 18:17:10 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Emmanuel Jeanvoine <emmanuel.jeanvoine@...ia.fr>,
	netdev@...r.kernel.org
Subject: Re: Poor TCP bandwidth between network namespaces

On Fri, 2013-02-08 at 17:33 -0800, Eric Dumazet wrote:

> Another thing to consider is the default MTU value :
> 
> 65536 for lo, and 1500 for veth
> 
> It easily explains half performance for veth
> 
> One another thing is the tx-nocache-copy setting, this can explain some
> extra percents.

By the way I get crashes when doing :

# ip link add name veth1 type veth peer name veth0
# rmmod veth

I'll submit a patch.



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