[Oisf-users] Tuning guide

Cloherty, Sean E scloherty at mitre.org
Wed May 17 13:53:25 UTC 2017

If you are using AF-PACKET (and why wouldn't you), the attached spreadsheet may help.  It is derived from Peter Manev's highly detailed review of various configuration options and their affect on memory utilization.  http://pevma.blogspot.com/2015/10/suricata-with-afpacket-memory-of-it-all.html

I began creating this during a Suricata training class so I could save time when testing different configurations.  Peter has reviewed it for accuracy and correct nomenclature.  I hope that it will be of some use to the community.

Sean Cloherty 

-----Original Message-----
From: Oisf-users [mailto:oisf-users-bounces at lists.openinfosecfoundation.org] On Behalf Of Cooper F. Nelson
Sent: Tuesday, May 16, 2017 15:07 PM
To: Brad Kingsbury <bradkingsbury at gmail.com>; oisf-users at lists.openinfosecfoundation.org
Subject: Re: [Oisf-users] Tuning guide

On 5/16/2017 11:57 AM, Brad Kingsbury wrote:
> Is there a tuning guide available for Suricata?  I'm looking for some 
> pretty basic "tuning" parameters, based upon the amount of RAM and 
> cores available.  Also, parameters to consider if doing just parsing v. detection.

This is the best one available currently:

> https://github.com/pevma/SEPTun

Might be overkill for tiny networks, though.

> Also, is the hyperscan library only used by the detection component, 
> or will it also provide improved performance in the parsing engine too?

That is an excellent questions and I have to admit I do not know the answer.  I'll hesitate a guess of 'no' as I run in delayed-detect mode and suricata will begin protocol logging well prior to generating alert traffic.  I think this is by design as the protocol detection logic is specifically tuned for that purpose, vs. being a generic pattern matcher.

Cooper Nelson
IT Security - Information Technology Services University of California San Diego
(858) 534-6487 - cnelson at ucsd.edu

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