_Performance Testing issues_

Branch: dpdk-next-net-intel

d37997a2f8f6f8451297f7052e684cb04c486a1b --> 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     | -0.254                              |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.399                               |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.239                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.003                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.006                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.001                               |
+------------+---------+-------------------------------------+

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: 1/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | -1.729                              |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.226                               |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.909                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.024                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0                                   |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0                                   |
+------------+---------+-------------------------------------+

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     | -0.054                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.113                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.317                              |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.038                              |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.014                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.001                              |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/5767/

UNH-IOL DPDK Performance Test Lab

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