_Performance Testing issues_

Branch: dpdk-next-net

5f57cb28a3fd9edfb13cf65a68af15af2b58404d --> performance testing fail

Test environment and result as below:

Ubuntu 18.04
Kernel: 4.15.0-generic
GCC: 7.4
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     | -0.648                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -1.626                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.625                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.010                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0                                   |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.008                              |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
GCC: 7.4
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     | -0.294                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.188                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.081                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.002                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.001                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.001                              |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
GCC: 7.4
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     | 0.124                               |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.137                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.081                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.079                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.066                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.027                               |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/5898/

UNH-IOL DPDK Performance Test Lab

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