From: Robert Olsson <robert.olsson@its.uu.se>
Date: Tue, 4 Oct 2005 20:01:58 +0000 (-0700)
Subject: [IPV4]: fib_trie root-node expansion
X-Git-Tag: v2.6.14-rc4~49^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e6308be85afee685347fa3440bed10faaa5d6c1a;p=pandora-kernel.git

[IPV4]: fib_trie root-node expansion

The patch below introduces special thresholds to keep root node in the trie
large. This gives a flatter tree at the cost of a modest memory increase.
Overall it seems to be gain and this was also proposed by one the authors
of the paper in recent a seminar.

Main table after loading 123 k routes.

	Aver depth:     3.30
	Max depth:      9
        Root-node size  12 bits
        Total size: 4044  kB

With the patch:
	Aver depth:     2.78
	Max depth:      8
        Root-node size  15 bits
        Total size: 4150  kB

An increase of 8-10% was seen in forwading performance for an rDoS attack.

Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
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