_Performance Testing issues_

Branch: dpdk-next-net-intel

4341f5c698aa59995b0a37ea5c0684cebf5067f3 --> performance testing fail

Test environment and result as below:

Ubuntu 18.04
Kernel: 4.15.0-generic
Compiler: gcc 7.4
NIC: Mellanox ConnectX-4 Lx 25000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 0/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | 1.47529%                            |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.02421%                           |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.34505%                            |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.78977%                            |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.05018%                           |
+------------+---------+-------------------------------------+
| 1518       | 256     | -0.27087%                           |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
Compiler: 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     | -0.01621%                           |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.05543%                           |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.33375%                           |
+------------+---------+-------------------------------------+
| 512        | 256     | -0.57476%                           |
+------------+---------+-------------------------------------+
| 1024       | 256     | -1.04403%                           |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.49587%                            |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
Compiler: 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     | -0.11692%                           |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.73485%                            |
+------------+---------+-------------------------------------+
| 256        | 256     | 0.20858%                            |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.11193%                            |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.02091%                           |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.12327%                            |
+------------+---------+-------------------------------------+

Ubuntu 18.04 ARM
Kernel: 4.15.0-132-generic
Compiler: gcc 7.5
NIC: Arm Mellanox ConnectX-5 10000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 2/4

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 128     | -2.72137%                           |
+------------+---------+-------------------------------------+
| 64         | 256     | -51.25366%                          |
+------------+---------+-------------------------------------+
| 64         | 512     | -50.68824%                          |
+------------+---------+-------------------------------------+
| 64         | 2048    | -3.14911%                           |
+------------+---------+-------------------------------------+

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/14065/

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