_Performance Testing issues_

Branch: dpdk-next-net

ba465d0cf8672032e0339cda7ef3a083b2d8a2af --> 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: 3/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -2.079                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -2.277                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -1.260                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.001                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.009                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.006                               |
+------------+---------+-------------------------------------+

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: 2/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -1.328                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -1.307                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.002                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.008                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.011                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.005                              |
+------------+---------+-------------------------------------+

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: 1/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -3.919                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.824                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.544                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.191                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.036                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.006                              |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/7027/

UNH-IOL DPDK Performance Test Lab

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