[Snort-users] Snort CPU usage

Mike Miller mike at ...16027...
Mon Feb 18 20:01:18 EST 2013

I believe they solved the problem by dodging it. Rather than multi-threading snort, they use PF_RING to get access closer to the hardware, and does so in a way that multiple threads running the same config will get access to separate packets (I'm still coming up to speed on it).

There are also PF_RING aware NICS that greatly improve processing....and I believe Suricata is multi-threaded, but I haven't used it yet, myself. 

On Feb 18, 2013, at 3:39 PM, Josh Bitto <jbitto at ...16055...> wrote:

> I’m bumping this back up…..I’m curious to hear. Is snort still only single threaded on a CPU or have newer versions allowed it to run on more than one core?
> I’m wanting to make sure I have enough machine to run my WAN and about 4 VLANs
> Each would have an interface to monitor, but where I’m stuck is the rule sets…
> I read online where a great determining calculation is this…
> 1 CPU = (1000 signatures ) * (500 megabits network traffic)
> So my question would be….if each interface has its own rule set aside from the main download of rules. Does that factor in?
> From: Josh Bitto [mailto:jbitto at ...16055...] 
> Sent: Monday, February 18, 2013 8:29 AM
> To: snort-users at lists.sourceforge.net
> Subject: [Snort-users] Snort CPU usage
> Does anyone have a url or program where I can calculate hardware requirements for running snort on my network?
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