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Re: [Fwd: [Snort-users] snort-2.6rc1 using a lot of memory]

from [Nerijus Krukauskas] Network Security [Permanent Link]
Subject: Re: [Fwd: [Snort-users] snort-2.6rc1 using a lot of memory]
Date: Thu, 20 Apr 2006 14:56:11 +0300 
On 19/04/06, Steven Sturges <steve.sturges@sourcefire.com> wrote:

Nerijus--

As noted in the RELEASE.NOTES, there was a change in the
default pattern matching engine from Wu-Manber to standard
Aho-Corasick which is faster but consumes more memory.


  Right, found that.


The Aho-Corasick implementation in snort has a few different
memory models, standard, full, banded, sparse, and sparse
banded.  The sparse and spare-banded ones consume much less
memory... To use them, add a snort.conf line, as desired,
for example.  Wu-Manber is being deprecated in the next
release.

config detection: search-method ac-sparsebands


  Found some explanations and possible values for search-method in
src/fpcreate.c. Would be nice to have that in snort_manual. Anyway,
thanks for clarifications and my test snort-2.6rc1 is now 204Mb of
resident size with ac-sparsebands.

--
http://nk99.org/


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