netdev - Re: [patch v4, kernel version 3.2.1] net/ipv4/ip

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Message-ID: <CAEP_g=_NBunt-ZPdN2Uj+GKWn1GRE4Rwis20YRMXtKofJavysQ@mail.gmail.com>
Date:	Fri, 27 Jan 2012 13:55:14 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	Joseph Glanville <joseph.glanville@...onvm.com.au>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>, steweg@...t.sk,
	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v4, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet
 multipoint GRE over IP

On Fri, Jan 27, 2012 at 2:54 AM, Joseph Glanville
<joseph.glanville@...onvm.com.au> wrote:
> Under pathological load OVS suffers in benchmarks, continual
> establishment of new flows is really not good for it - I haven't
> observed this personally though.
> It does however worry me that this could be used as a viable DoS.. I
> don't really know what could be done to mitigate this however.

OVS allows each input port to have a separate genl socket associated
with it for the purpose of sending flow misses to userspace.
Currently userspace uses this to round-robin around these sockets when
handling flow setup requests in order to prevent one port from DoSing
the others.
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