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Poor performance with Snort 2.9.4.6 under OpenBSD 5.3
From: "C. L. Martinez" <carlopmart () gmail com>
Date: Thu, 30 May 2013 12:45:25 +0000

Hi all,

 According to the following stats:

May 30 11:46:22 nsm01 snort[30096]:
===============================================================================
May 30 11:46:22 nsm01 snort[30096]: Packet Performance Summary:
May 30 11:46:22 nsm01 snort[30096]:    max packet time       : 10000 usecs
May 30 11:46:22 nsm01 snort[30096]:    packet events         : 654
May 30 11:46:22 nsm01 snort[30096]:    avg pkt time          : 27.1384 usecs
May 30 11:46:22 nsm01 snort[30096]: Rule Performance Summary:
May 30 11:46:22 nsm01 snort[30096]:    max rule time         : 4096 usecs
May 30 11:46:22 nsm01 snort[30096]:    rule events           : 20
May 30 11:46:22 nsm01 snort[30096]:    avg rule time         : 1.046 usecs
May 30 11:46:22 nsm01 snort[30096]:
===============================================================================
May 30 11:46:22 nsm01 snort[30096]: Packet I/O Totals:
May 30 11:46:22 nsm01 snort[30096]:    Received:     69971576
May 30 11:46:22 nsm01 snort[30096]:    Analyzed:     22427618 ( 32.052%)
May 30 11:46:22 nsm01 snort[30096]:     Dropped:     41532168 ( 37.247%)
May 30 11:46:22 nsm01 snort[30096]:    Filtered:            0 (  0.000%)
May 30 11:46:22 nsm01 snort[30096]: Outstanding:     47543958 ( 67.948%)
May 30 11:46:22 nsm01 snort[30096]:    Injected:            0
May 30 11:46:22 nsm01 snort[30096]:
===============================================================================
May 30 11:46:22 nsm01 snort[30096]: Breakdown by protocol (includes
rebuilt packets):
May 30 11:46:22 nsm01 snort[30096]:         Eth:     22436767 (100.000%)
May 30 11:46:22 nsm01 snort[30096]:        VLAN:            0 (  0.000%)
May 30 11:46:22 nsm01 snort[30096]:         IP4:     22436767 (100.000%)
May 30 11:46:22 nsm01 snort[30096]:        Frag:           12 (  0.000%)
May 30 11:46:22 nsm01 snort[30096]:        ICMP:       110634 (  0.493%)
May 30 11:46:22 nsm01 snort[30096]:         UDP:       752816 (  3.355%)
May 30 11:46:22 nsm01 snort[30096]:         TCP:     19433478 ( 86.614%)

using snort under OpenBSD 5.3 doesn't returns good performance. Host
is a Intel(R) Xeon(R) CPU E5620 @ 2.40GHz, with 8 GiB RAM and four
e1000 interfaces.

 In this sensor, I only use so_rules:

# dynamic library rules
# include $SO_RULE_PATH/bad-traffic.rules
# include $SO_RULE_PATH/chat.rules
include $SO_RULE_PATH/dos.rules
include $SO_RULE_PATH/exploit.rules
# include $SO_RULE_PATH/icmp.rules
# include $SO_RULE_PATH/imap.rules
include $SO_RULE_PATH/misc.rules
include $SO_RULE_PATH/multimedia.rules
include $SO_RULE_PATH/netbios.rules
# include $SO_RULE_PATH/nntp.rules
include $SO_RULE_PATH/p2p.rules
include $SO_RULE_PATH/smtp.rules
# include $SO_RULE_PATH/snmp.rules
include $SO_RULE_PATH/specific-threats.rules
include $SO_RULE_PATH/web-activex.rules
include $SO_RULE_PATH/web-client.rules
include $SO_RULE_PATH/web-iis.rules
include $SO_RULE_PATH/web-misc.rules

and monitored network is a 1GiB network.

 Any ideas why??

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