_Performance Testing issues_

Branch: dpdk-next-virtio

818b8f2155161d975779ff4799e28fe17b73746a --> performance testing fail

Test environment and result as below:

Ubuntu 17.10
Kernel: 4.13.0-43-generic
GCC: gcc (Ubuntu 7.2.0-8ubuntu3) 7.2.0
NIC: Intel Corporation Ethernet Converged Network Adapter XL710-QDA2 40000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 0/2

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 512     | -0.039                              |
+------------+---------+-------------------------------------+
| 64         | 2048    | 0.014                               |
+------------+---------+-------------------------------------+

Ubuntu 17.10
Kernel: 4.13.0-43-generic
GCC: gcc (Ubuntu 7.2.0-8ubuntu3) 7.2.0
NIC: Intel Corporation Ethernet Converged Network Adapter 82599ES 10000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 1/3

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 128     | 0.124                               |
+------------+---------+-------------------------------------+
| 64         | 512     | -6.560                              |
+------------+---------+-------------------------------------+
| 64         | 2048    | 0.013                               |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/5024/

UNH-IOL DPDK Performance Test Lab

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