[Snort-users] Poor performance with Snort 2.9.4.6 under OpenBSD 5.3

C. L. Martinez carlopmart at ...11827...
Sat Jun 1 02:57:51 EDT 2013


Please, any idea where can it be the problem??.

I have do it more tests with same results. For example I have increased bpf
max buffers size, doing a minimal snort conf, but nothing.

On Thursday, May 30, 2013, C. L. Martinez <carlopmart at ...11827...> wrote:
> 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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