_Performance Testing issues_

Branch: dpdk-next-net-intel

da4d18556b03e2da81f8959dd6f59677d3d78afe --> 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 25000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 2/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -1.417                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -1.501                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.004                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.037                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.003                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.012                               |
+------------+---------+-------------------------------------+

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: 3/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -2.204                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -1.901                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -1.443                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.002                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.014                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.002                              |
+------------+---------+-------------------------------------+

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: 2/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -3.180                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -1.279                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.620                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.123                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.044                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.007                               |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/7053/

UNH-IOL DPDK Performance Test Lab

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