netdev - Re: DDoS attack causing bad effect on conntrack searches

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Message-Id: <20100423.011845.254684857.davem@davemloft.net>
Date:	Fri, 23 Apr 2010 01:18:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	hawk@...u.dk, paulmck@...ux.vnet.ibm.com, kaber@...sh.net,
	xiaosuo@...il.com, hawk@...x.dk, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: DDoS attack causing bad effect on conntrack searches

From: David Miller <davem@...emloft.net>
Date: Fri, 23 Apr 2010 01:13:28 -0700 (PDT)

> I really can't see what might cause this behavior then.

This all reminds me of the namespace bug we dealt with
a month or two ago.

Jesper, you don't happen to be using network namespaces are you?
Because if so, the following might be your cure.

commit 5b3501faa8741d50617ce4191c20061c6ef36cb3
Author: Eric Dumazet <eric.dumazet@...il.com>
Date:   Mon Feb 8 11:16:56 2010 -0800

    netfilter: nf_conntrack: per netns nf_conntrack_cachep
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