netdev - Re: [PATCH] net: implement emergency route cache rebulds when gc

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Date:	Tue, 30 Sep 2008 07:10:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	nhorman@...driver.com, netdev@...r.kernel.org,
	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [PATCH] net: implement emergency route cache rebulds when
 gc_elasticity is exceeded

From: Eric Dumazet <dada1@...mosbay.com>
Date: Tue, 30 Sep 2008 08:02:44 +0200

> When a machine is targeted by a DDOS attack, about all slots of the
> hash table are fully loaded (ie chain length >= elasticity). We dont
> need to invalidate the cache, but find an equilibrium, with small
> adjustements.

Sure, but it is possible to determine that some hash chains
are unevenly growing out of control compared to others,
and that is the algorithm that Neil is trying to discover.
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