_Performance Testing issues_

Branch: dpdk-next-net-mlx

faf1528175811bd82c79e109e0cdc05cb8d256e9 --> performance testing fail

Test environment and result as below:

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     | -3.424                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.834                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.539                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.006                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.055                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.029                              |
+------------+---------+-------------------------------------+

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     | -1.645                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -2.510                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -1.277                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.005                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.026                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.005                               |
+------------+---------+-------------------------------------+

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     | -1.125                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -1.332                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.016                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.018                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.017                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.009                               |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/7011/

UNH-IOL DPDK Performance Test Lab

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