_Performance Testing issues_

Branch: dpdk-next-net-mlx

d27605855e7d481ec2c02dfa91f2aa8efa4019bf --> 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     | -0.330                              |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.048                               |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.054                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.274                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.085                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.007                              |
+------------+---------+-------------------------------------+

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     | -0.057                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.359                              |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.213                               |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.040                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.006                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.004                               |
+------------+---------+-------------------------------------+

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     | -0.145                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.247                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -1.033                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.003                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0                                   |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.004                               |
+------------+---------+-------------------------------------+

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/10708/

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