_Performance Testing issues_

Branch: dpdk-next-net-mrvl

75265ee83b22df40de4cb36b2ceb44dd6ae70c2b --> performance testing fail

Test environment and result as below:

Ubuntu 18.04
Kernel: 4.15.0-generic
Compiler: 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     | -0.159                              |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.135                               |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.003                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.136                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.020                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.023                              |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
Compiler: 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     | -0.101                              |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.126                               |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.017                               |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.001                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.020                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.013                               |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
Compiler: 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     | -1.013                              |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.461                               |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.163                               |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.009                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.001                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.001                              |
+------------+---------+-------------------------------------+

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/10113/

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