_Performance Testing issues_

Branch: dpdk-next-net-mlx

4cbbf81d1c4a3a70b522be3a7bc78a7e720dbcc0 --> 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     | -0.337                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -1.535                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.692                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.008                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0                                   |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.007                              |
+------------+---------+-------------------------------------+

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     | -0.362                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.208                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.068                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.007                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.003                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.004                               |
+------------+---------+-------------------------------------+

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     | -0.005                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.084                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.086                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.055                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.047                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.015                               |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/5893/

UNH-IOL DPDK Performance Test Lab

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