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

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Message-ID: <Pine.LNX.4.64.1004231440190.840@ask.diku.dk>
Date:	Fri, 23 Apr 2010 14:45:59 +0200 (CEST)
From:	Jesper Dangaard Brouer <hawk@...u.dk>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Changli Gao <xiaosuo@...il.com>, hawk@...x.dk,
	Linux Kernel Network Hackers <netdev@...r.kernel.org>,
	netfilter-devel@...r.kernel.org,
	Paul E McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: DDoS attack causing bad effect on conntrack searches

On Fri, 23 Apr 2010, Patrick McHardy wrote:

> That sounds like a good idea. But lets what for Jesper's test results
> before we start fixing this problem :)

I will first have time to perform the tests Monday or Tuesday.

BUT I have just noticed there seems to be a corrolation between conntrack 
early_drop and searches.  I have upload a new graph:

  http://people.netfilter.org/hawk/DDoS/2010-04-12__001/conntrack_early_drop002.png

I have not had time to checkout the code path yet...

Cheers,
   Jesper Brouer

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