_Performance Testing issues_

Branch: dpdk

96c343868dd15ebdc74371a9dea2288b30ce13ea --> 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: 6/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -31.836                             |
+------------+---------+-------------------------------------+
| 128        | 256     | -33.380                             |
+------------+---------+-------------------------------------+
| 256        | 256     | -28.030                             |
+------------+---------+-------------------------------------+
| 512        | 256     | -18.741                             |
+------------+---------+-------------------------------------+
| 1024       | 256     | -9.574                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | -6.488                              |
+------------+---------+-------------------------------------+

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: 6/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -28.629                             |
+------------+---------+-------------------------------------+
| 128        | 256     | -28.733                             |
+------------+---------+-------------------------------------+
| 256        | 256     | -19.354                             |
+------------+---------+-------------------------------------+
| 512        | 256     | -11.692                             |
+------------+---------+-------------------------------------+
| 1024       | 256     | -5.978                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | -4.049                              |
+------------+---------+-------------------------------------+

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     | 0.044                               |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.056                               |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.463                               |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.061                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.007                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.030                              |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/5658/

UNH-IOL DPDK Performance Test Lab

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