[Oisf-users] Suricata, 10k rules, 10Gbit/sec and lots of RAM

Michał Purzyński michalpurzynski1 at gmail.com
Wed Nov 5 00:08:25 UTC 2014

Suricata 2.0.4, 128GB memory, around 10.5k rules from ET. The startup
process is loooong, then it fails, eating all the memory. Is it
expected? I've tried using ac-bs but gave up after like >20 minutes
waiting for it to start.

  - profile: custom
  - custom-values:
      toclient-src-groups: 200
      toclient-dst-groups: 200
      toclient-sp-groups: 200
      toclient-dp-groups: 300
      toserver-src-groups: 200
      toserver-dst-groups: 400
      toserver-sp-groups: 200
      toserver-dp-groups: 200
  - sgh-mpm-context: full
  - inspection-recursion-limit: 3000

mpm-algo: ac

Now, if I change the sgh-mpm-context to 'auto' it can start, using
around 40GB of memory. Does it mean that auto = single?

I'm kind of concerned that rules cannot fit in the memory with
sgh-mpm-context set to full and the settings presented. Should I be?

What is better - use profile: high and context: full (if it fits) or
profile: custom with settings presented and sgh-mpm-context: auto?

Michał Purzyński

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