_Performance Testing issues_

Branch: dpdk-next-net-mlx

aef1d0733179afb56916e95058a4f1398b81af04 --> performance testing fail

Test environment and result as below:

Ubuntu 18.04
Kernel: 4.15.0-generic
GCC: 7.4
NIC: Intel Corporation Ethernet Converged Network Adapter 82599ES 10000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 1/3

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 128     | -40.928                             |
+------------+---------+-------------------------------------+
| 64         | 512     | 0.036                               |
+------------+---------+-------------------------------------+
| 64         | 2048    | 0.187                               |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
GCC: 7.4
NIC: Intel Corporation Ethernet Converged Network Adapter XL710-QDA2 40000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 1/2

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 512     | -1.129                              |
+------------+---------+-------------------------------------+
| 64         | 2048    | -0.019                              |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/7390/

UNH-IOL DPDK Performance Test Lab

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