[Snort-devel] Huge performance drop for Snort-2.9.4

Bhagya Bantwal bbantwal at ...402...
Thu Feb 7 15:08:13 EST 2013


Hello,

Can you please send us the configure options you used with both releases?

ipv6 was enabled by default in 2.9.1 and hardened in the release 2.9.4.

Thanks
-Bhagya

On Thu, Feb 7, 2013 at 7:04 AM, abed mohammad kamaluddin
<abedamu at ...2499...>wrote:

> Hi,
>
> While upgrading from 2.9.0.4 to 2.9.4, there is huge performance drop.
> I have compiled both sources using the same libraries, same compiler
> options (default) and am running in the same environment using exactly
> the same configuration and rule files. There is anything between 15 -
> 40 % decrease in performance depending upon the traffic.
>
> I used Intel(R) Xeon(R) CPU X5650  @2.67GHz and daq pcap for the
> tests. However live traffic also gives than 20% drop in performance.
> Similar behavior is also seen on MIPs cpu. Here are the observations:
>
> Pcap with no alerts, uniform large-sized half-million UDP pkts
> snort-2.9.0.4  -  1692 Mbps
> snort-2.9.4    -   1364 Mbps  (~20% drop)
>
> Pcap with one alert - non-uniform small-sized TCP pkts
> snort-2.9.0.4  254 Mbps
> snort-2.9.4     163 Mbps  (~35 % drop)
>
> This is easily reproducible using all types of traffic. Just to make
> sure, I also tried 2.9.3.1 and it gave me good performance equivalent
> to 2.9.0.4. So the reduction has crept up in 2.9.4 itself. I haven't
> explored it, but maybe consolidation of IPv6 is the cause?
>
> My earlier mail regarding optimization
> (http://seclists.org/snort/2013/q1/195) has the same proportionate
> performance enhancement on both 2.9.4 and 2.9.0.4.
>
> Thanks,
> Abed M K
>
>
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