[Oisf-users] Suricata Myricom and 10Gbit

Michał Purzyński michalpurzynski1 at gmail.com
Mon Mar 31 11:27:17 UTC 2014


I'm trying to tune Suricata to handle up to 10Gbit/sec of traffic (that's a
peak, jumps like crazy from 2.5 - 4.5 - 6 and up). So far my results were
quite bad, so I'm seeking help - must be missing something obvious here
judging by the numbers of articles where everyone seems to use Suricata on
10Gbit traffic.


2 x Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz (16 physical cores)

NIC - Myricom 10Gb 10G-PCIE-8B-S with the Sniffer software loaded and


This is Suricata version 2.0rc2 RELEASE

Command line:

SNF_DATARING_SIZE=1073741824 SNF_DEBUG_MASK=0x3 suricata -c
/etc/nsm/nsm11-eth4/suricata.yaml -i eth4 --runmode=workers

(16 threads, 1GB for each buffer)

The Myricom debug output seems fine.

Config file - pretty standard, most important things:

max-pending-packets: 5000
runmode: workers

  - profile: medium

Did not touch parameters here.

  set-cpu-affinity: no

Also default settings here.

  detect-thread-ratio: 1.5

(should not it be 1.0?)

  memcap: 512mb
  trackers: 65535 # number of defragmented flows to follow
  max-frags: 65535 # number of fragments to keep (higher than trackers)
  prealloc: yes
  timeout: 60

  memcap: 32mb
  hash-size: 65536
  prealloc: 10000
  emergency-recovery: 30

  memcap: 16gb
  max-sessions: 20000000
  prealloc-sessions: 10000000
  checksum-validation: yes      # reject wrong csums
  inline: no                    # no inline mode
    memcap: 14gb
    depth: 6mb                  # reassemble 1mb into a stream
    toserver-chunk-size: 2560
    toclient-chunk-size: 2560

  - interface: eth4
    threads: 16
    buffer-size: 512kb
    checksum-checks: no

The myricom tools show a high packet loss

                     SNF recv pkts:            634485790
                SNF drop ring full:            137774061
                        Interrupts:             12053363
           Net bad PHY/CRC32 drop:                32092
                 Net overflow drop:               219656

Also note that it reports quite a few interrupts, which there should be
almost none.

What is the direction I should go here? I know that tuning a high capacity
Suricata isn't exactly a single afternoon task, but I need to advise what
to do now, how to proceed, etc.

Looking for clues.

Michał Purzyński
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