[Oisf-users] Performance on multiple CPUs

Gene Albin gene.albin at gmail.com
Thu Aug 25 18:12:59 UTC 2011

Does anyone know how Suricata determines the number of CPU's available on
the machine?  I'm asking because I need to know how to tell Suricata how
many to use when submitting jobs on this research computer.  /proc/cpuinfo
always returns the total number of physical CPU's, and in my case I want to
test performance on a subset of the maximum (48).

What environment variable, or other parameter, do I need to pass to Suricata
in order to specify the number of CPUs available.


On Thu, Aug 4, 2011 at 1:07 PM, saldanha <poonaatsoc at gmail.com> wrote:

>  On 08/03/2011 08:50 AM, Gene Albin wrote:
> So I just installed Suricata on one of our research computers with lots of
> cores available.  I'm looking to see what kind of performance boost I get as
> I bump up the CPU's. After my first run I was surprised to see that I didn't
> get much of a boost when going from 8 to 32 CPUs.  I was running a 6GB pcap
> file with a about 17k rules loaded.  The first run on 8 cores took 190sec.
> The second run on 32 cores took 170 sec.  Looks like something other than
> CPU is the bottle neck.
> My first guess is Disk IO.  Any recommendations on how I could check/verify
> that guess?
> Gene
> --
> Gene Albin
> gene.albin at gmail.com
> _______________________________________________
> Oisf-users mailing listOisf-users at openinfosecfoundation.orghttp://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users
> * forgot to reply to the list previously
> Hey Gene.
> Can you test by increasing the max-pending-packets in the suricata.yaml
> file to a higher value.  You can try one run with a value of 500 and then
> try higher values(2000+ suggested.  More the better, as long as you don't
> hit swap).
> Once you have set a higher max-pending-packets you can try running suricata
> in autofp runmode.  autofp mode runs suricata in flow-pinned mode.  To do
> this add this option to your suricata command line "--runmode=autofp.  "
> sudo suricata -c ./suricata.yaml -r your_pcap.pcap --runmode=autofp
> With max-pending-packets set to a higher value and with --runmode=autofp,
> you can test how suricata scales from 4 to 32 cores.
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Gene Albin
gene.albin at gmail.com
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