Question about CPU affinity for interrupts

[Roger Campbell <rcampbell2020 () gmail com>]

Hi everyone, had a question about IRQs and PF_RING.

Currently I'm testing out PF_RING and snort 2.9.6 on a 1Gb/s link that
usually tops out around 800Mb/s.  The system has 16 physical cores (32
Hyper-Threads).

If I run 8 snort instances in the format below, load is handled pretty well.

snort -R 1 --daq-dir=/usr/local/lib/daq --daq pfring --daq-mode passive
--daq-var clusterid=10 --daq-var bindcpu=4 -c /IDS/snort/etc/snort.conf -l
/IDS/snort/log1 -u snort -g snort -i eth4 -D
snort -R 2 --daq-dir=/usr/local/lib/daq --daq pfring --daq-mode passive
--daq-var clusterid=10 --daq-var bindcpu=6 -c /IDS/snort/etc/snort.conf -l
/IDS/snort/log2 -u snort -g snort -i eth4 -D
(continues using CPU 8,10,12,14,16,18)

I know that I should set CPU affinity for interrupts for each rx queue to a
specific CPU or set of CPUs.  My question is, should I bind these to 8 free
cores, or should I bind them to cores which are already hosting a snort
process?

All of the IRQs are currently being processed by ksoftirqd/0 on CPU 0 which
is not optimal.

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