title: Can't transmit packets in DPDK sample application
body: <p>I have set up DPDK 17.08.01 on an Ubuntu 16.04.2 system. I've followed the guides involving HugePages setup. I have set up 2048 HugePages (1024 pages per NUMA core), with each page being 2048 kB. This can be shown with the command <code>cat /proc/meminfo</code>: </p>
  
  <pre><code>HugePages_Total:    2048
  HugePages_Free:        0
  HugePages_Rsvd:        0
  HugePages_Surp:        0
  Hugepagesize:       2048 kB
  </code></pre>
  
  <p>I believe the <code>HugePages_Free</code> is <code>0</code> because I already started running an application on DPDK. They have no issue try to allocate <code>HugePages</code> as far as I know.</p>
  
  <p>I have also attached the corresponding drivers necessary to two of my interfaces Here is the output of <code>usertools/dpdk-devbind.py --status</code>:</p>
  
  <pre><code>Network devices using DPDK-compatible driver
  ============================================
  0000:01:00.0 '82599ES 10-Gigabit SFI/SFP+ Network Connection 10fb' drv=igb_uio unused=uio_pci_generic
  0000:01:00.1 '82599ES 10-Gigabit SFI/SFP+ Network Connection 10fb' drv=igb_uio unused=uio_pci_generic
  
  Network devices using kernel driver
  ===================================
  0000:84:00.0 '82580 Gigabit Network Connection 150e' if=ens2f0 drv=igb unused=igb_uio,uio_pci_generic *Active*
  0000:84:00.1 '82580 Gigabit Network Connection 150e' if=ens2f1 drv=igb unused=igb_uio,uio_pci_generic 
  0000:84:00.2 '82580 Gigabit Network Connection 150e' if=ens2f2 drv=igb unused=igb_uio,uio_pci_generic 
  0000:84:00.3 '82580 Gigabit Network Connection 150e' if=ens2f3 drv=igb unused=igb_uio,uio_pci_generic
  </code></pre>
  
  <p>I am trying the simple <code>basicfwd</code> sample application, which simply forwards from one port to the other. When I put in debug statements, however, I see only two loops for each port, and afterwards the application hangs. I am assuming the forwarding and whatnot is supposed to go on until the user stops it. Two packets are received in each port, but nothing is transmitted unfortunately.</p>
  
  <p>I understand the issue is a bit vague, and related to <code>DPDK</code> setup, but any other help with commands to use for debugging, things I should check, would be appreciated, as I am a beginner with <code>DPDK</code>. I haven't been able to find any good diagnosing tips online.</p>