_Performance Testing issues_

Branch: dpdk-next-net

ad40e0470135dbc95d6bf3a8d3471af6e305842b --> 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     | 0.037                               |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.160                              |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.085                               |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.002                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.047                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.011                               |
+------------+---------+-------------------------------------+

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: 0/0

Detail performance results: 
There were no deltas reported. There may have been an issue with the test harness. If logs are available, download them from the ci website for more information.

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/9807/

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