_Performance Testing issues_

Branch: dpdk-next-net-mlx

d70160ce3ac98b2687e7c40bcadee004779b5305 --> 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     | 0.367                               |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.310                               |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.117                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.060                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.123                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.024                              |
+------------+---------+-------------------------------------+

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     | 0.119                               |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.980                              |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.049                               |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.041                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.005                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.002                              |
+------------+---------+-------------------------------------+

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     | 0.160                               |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.157                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -1.015                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.026                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.017                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.010                               |
+------------+---------+-------------------------------------+

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/13397/

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