Re: high packet loss - low throughput

[Michal Purzynski <michal () rsbac org>]

On 7/17/13 11:01 PM, waldo kitty wrote:
> On 7/17/2013 16:04, Michal Purzynski wrote:
> > Hello,
> >
> > I can see a strange results on a local snort installation. Either I
> > don't understand something or the statistics aren't precise. Please help
> > me understand.
> >
> > It's an (expanding) two hosts snort setup with 2 x E5-2620 0 @ 2.00GHz /
> > 64GB RAM each.
> > Intel x520 card.
> > Traffic is around 1Gbit to each host.
> > Around 3500 VRT only rules enabled.
> > 8 snort instances load balanced by the pf_ring.
> what else is this machine doing besides just snorting the traffic?
netsniff-ng, barnyard, snort and that's it. Part of a Security Onion, 
but with most things (like Bro, argus, prads, etc) disabled.
> > The traffic loss is very high - up to 9% per instance (as reported by
> > Sguil which in turn read the snort logs and debug files). A single
> > instance gets from 90 - 150Mbits of traffic and from 10 - 20k pps. To
> > make it worse, the loss is not dependent on the traffic and/or pps at
> > all. Actualy, sometimes I get a 5% of loss on 50Mbits to a single instance.
> what happens if you increase the number of snort instances which would thereby
> reduce the load on each of the instances?
I did it increasing from 6 to 8. And it won't help, really - if snort 
cannot keep up with 50Mbit / instance stream...
> > Again, the traffic loss numbers are from the snort stats.
> >
> > There's nothing fancy in the snort conf as well. Daq is configured as
> > follows.
> >
> > config daq: pfring
> > config daq_dir: /opt/pfring/lib/daq
> > config daq_var: clusterid=51
> > config daq_var: clustermode=5


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