[Snort-users] CPU Affinity

Livio Ricciulli livio at ...15149...
Sun Jan 27 14:54:50 EST 2013


I am not sure; I would think so... We have always used the pf_ring DAQ 
because we want to support inline also..
Livio.

On 1/26/2013 11:36 AM, Craig Merchant wrote:
>
> Thanks, Livio... So, we use PF-RING with the DNA/Libzero drivers.  But 
> Snort uses the pcap DAQ to access the Libzero interfaces, not the 
> pf_ring DAQ.
>
> Does that make any difference?
>
> Thanks.
>
>
> C
>
> *From:*Livio Ricciulli [mailto:livio at ...15149...]
> *Sent:* Friday, January 25, 2013 10:05 PM
> *To:* snort-users at lists.sourceforge.net
> *Subject:* Re: [Snort-users] CPU Affinity
>
> According to our empirical measurements using PF-RING (if that's what 
> you are using), DON'T use CPU affinity; DON'T bind CPUs. Let the Linux 
> scheduler do what it wishes..
> The definite proof is to compare identical runs using different setups 
> on your hardware, with your rules, with your traffic..
> However, i would bet that what I recommended above will win..
>
> Livio.
> On 1/25/2013 1:59 PM, Craig Merchant wrote:
>
> We have a Snort sensor that runs 28 instances.  Their CPU utilization 
> tends average between 25% and 95%+.  I've read opinions both ways for 
> setting CPU affinity.  What are the benefits/drawbacks of setting CPU 
> affinity?
>
> Thx.
>
>
> Craig
>
>
>
>
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> -- 
> Livio Ricciulli
> MetaFlows Inc.
> (408) 835-5005
>
>
> ------------------------------------------------------------------------------
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-- 
Livio Ricciulli
MetaFlows Inc.
(408) 835-5005

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