[Bro] Core affinity on AMD Opteron 6276

[erik clark]

We are an intel shop, so I couldnt say for sure. We are running 2.5ghz?
cores.

On Thu, Jan 12, 2017 at 10:33 PM, Ralph Holz <ralph.holz.tech at gmail.com>
wrote:

> Hi Erik,
>
> Thanks for the links!
>
> I used lstopo to get an idea of the hardware layout, but I wanted some
> script that would figure out which cores share circuitry (because Opteron).
> Reading through your thread, it seems my script does the right thing.
>
> As for your setup - do you use an Opteron? And what is the clock rate of
> your cores?
>
> Thanks again!
>
> Ralph
>
> On Thu, Jan 12, 2017 at 11:20 PM erik clark <philosnef at gmail.com> wrote:
>
>> Ralph, you may want to look back at the archives. Michal and I think
>> Justin had posted an extensive discussion on how to identify and pin cpus.
>> See:
>>
>> http://mailman.icsi.berkeley.edu/pipermail/bro/2016-October/010743.html
>>
>> The suggested lstopo is a very good way to enumerate your cores, as
>> indicated in that thread. :)
>>
>> Also, regarding 32 workers, we are handling 6Gb/s traffic with af_packet
>> with just 18 workers, minimum memory usage, but fairly high rate of cpu
>> usage. Our drop rate is under .5% across all workers.
>>
>> Lastly, read the Bro bit here:
>>
>> https://www.sans.org/reading-room/whitepapers/intrusion/
>> open-source-ids-high-performance-shootout-35772
>>
>> We have found that this is indeed fairly accurate with regards to worker
>> count and pps consumption by bro.
>>
>>
>>
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