_Performance Testing issues_

Branch: dpdk-next-net-mlx

b57939fcf833c99db90fdbb4b1a3dd2d45fd6bda --> performance testing fail

Test environment and result as below:

Ubuntu 18.04
Kernel: 4.15.0-generic
Compiler: gcc 7.4
NIC: Intel Corporation Ethernet Converged Network Adapter XL710-QDA2 40000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 0/2

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 512     | -0.393                              |
+------------+---------+-------------------------------------+
| 64         | 2048    | 0.041                               |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
Compiler: gcc 7.4
NIC: Intel Corporation Ethernet Converged Network Adapter 82599ES 10000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 1/2

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 512     | 0.046                               |
+------------+---------+-------------------------------------+
| 64         | 2048    | -1.157                              |
+------------+---------+-------------------------------------+

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/8736/

UNH-IOL DPDK Community Lab

To manage your email subscriptions, visit: 
https://lab.dpdk.org/results/dashboard/preferences/subscriptions/