I'm testing out a new server (36 cores, 72 with HT) using
zbalance_ipc, and it seems occasionally some packets are
getting sent to multiple processes. 

I'm currently running zbalance_ipc like so: 

  /usr/local/pf/bin/zbalance_ipc -i zc:ens5f0 -m 4 -n 72,1 -c 99 -g 0 -S 1

with 72 snorts like so: 

  /usr/sbin/snort -D -i zc:99@$i --daq-dir=/usr/lib64/daq \
  --daq-var clusterid=99 --daq-var bindcpu=$i --daq pfring_zc \
  -c /etc/snort/ufirt-snort-pf-ewan.conf -l /var/log/snort69 -R ($i + 1)

I've got a custom HTTP rule to catch GETs with a particular 
user-agent. I run 100 GETs, and each GET request has the run
number and timestamp in the url. (GET /1/<ts>, GET /2/<ts>, etc) 
and this is what I end up getting when I check the GETs : 

      1 GET /11
      1 GET /2
      1 GET /30
      1 GET /34
      1 GET /37
      1 GET /5
      1 GET /59
      1 GET /62
      1 GET /70
      1 GET /8
      1 GET /83
      1 GET /84
      1 GET /9
      1 GET /90
      1 GET /94
      1 GET /95
     16 GET /97
     20 GET /12
     20 GET /38

Obviously I'm still running into packet loss, but several of the
GETs are getting sent to multiple processes: 

    ens5f0.33 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.53 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.42 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.44 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.46 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.35 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.67 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.34 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.36 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.62 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.70 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.65 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.57 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.63 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.68 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.38 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.49 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.61 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.32 GET /12/2016-10-13.14:04:49 HTTP/1.1
    ens5f0.72 GET /12/2016-10-13.14:04:49 HTTP/1.1

Is this an issue with the zbalance_ipc hash? I tried using
  
  -m 1

but it seemed like I ended up dropping even more packets. 

Any advice/pointers appreciated. 

--
Jim Hranicky
Data Security Specialist
UF Information Technology
105 NW 16TH ST Room #104 GAINESVILLE FL 32603-1826
352-273-1341
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