_Performance Testing issues_

Branch: dpdk-next-net

9d2070ff8ffac092ebdcde78fc61575e5599730e --> performance testing fail

Test environment and result as below:

Ubuntu 16.04
Kernel: 4.4.0-109-generic
GCC: 5.4.0-6ubuntu1~16.04.6
NIC: Mellanox ConnectX-4 Lx 40000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 1/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -2.126                              |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.103                               |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.174                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.046                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.010                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.020                               |
+------------+---------+-------------------------------------+

Ubuntu 16.04
Kernel: 4.4.0-109-generic
GCC: 5.4.0-6ubuntu1~16.04.6
NIC: Mellanox ConnectX-5 100000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 0/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -0.399                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.154                              |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.073                               |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.027                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.056                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.021                              |
+------------+---------+-------------------------------------+

Ubuntu 16.04
Kernel: 4.4.0-109-generic
GCC: 5.4.0-6ubuntu1~16.04.6
NIC: Mellanox ConnectX-4 Lx 25000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 0/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -0.090                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.100                              |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.132                               |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.008                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.003                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0                                   |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/5147/

UNH-IOL DPDK Performance Test Lab

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