netdev - Re: IP/UDP encapsulation

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Message-ID: <1270722573.2215.47.camel@edumazet-laptop>
Date:	Thu, 08 Apr 2010 12:29:33 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Mark Smith <lk-netdev@...netdev.nosense.org>
Cc:	"Gustavo F. Padovan" <gustavo@...ovan.org>, netdev@...r.kernel.org,
	marco bonola <marco.bonola@...il.com>,
	"ZioPRoTo (Saverio Proto)" <zioproto@...il.com>,
	Behling Mario <mb@...iobehling.de>,
	"L. Aaron Kaplan" <aaron@...res.org>
Subject: Re: IP/UDP encapsulation

Le jeudi 08 avril 2010 à 19:18 +0930, Mark Smith a écrit :
> On Thu, 8 Apr 2010 04:42:47 -0300
> "Gustavo F. Padovan" <gustavo@...ovan.org> wrote:
> 
> > Hi,
> > 
> > I'm looking for some advice on that work. The Freifunk organization is
> > planning work on the IP/UDP encapsulation kernel module as a GSoC
> > project. The idea is to create a IP-in-UDP tunnel like we do for
> > IP-in-IP or IP-in-GRE tunnels. The only way to do that today is to use
> > some VPN software.
> > 
> > The module will export its virtual interface through sockets and will
> > have support for the standard syscalls like the others encapsulation
> > modules.
> > 
> > It will improve the performance of mesh networks that will we be able
> > to use IP-in-UDP rather than IP-in-IP.
> 
> I'm a bit confused. How can tunnelling IP in UDP in IP be faster than IP in IP?
> 

Maybe the 'gateway' doesnt handle IPIP at all ;)

Until 2.6.32, IPIP tunnels were not so scalable then UDP (RCU enabled)
ipip_rcv() was hitting a global rwlock

git describe 8f95dd63a2ab6fe7243c4f0bd2c3266e3a5525ab
v2.6.32-rc3-468-g8f95dd6



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