_Performance Testing issues_

Branch: dpdk-next-net-brcm

318f1627fcbe01ce3008bed0ac7da02816eda921 --> performance testing fail

Test environment and result as below:

Ubuntu 18.04
Kernel: 4.15.0-generic
GCC: 7.4
NIC: Mellanox ConnectX-4 Lx 40000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 0/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -0.158                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.277                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.077                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.020                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.024                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.010                              |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
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     | -0.793                              |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.010                               |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.071                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.109                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.037                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.004                               |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
GCC: 7.4
NIC: Mellanox ConnectX-4 Lx 25000 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.

https://lab.dpdk.org/results/dashboard/tarballs/7392/

UNH-IOL DPDK Performance Test Lab

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