_Performance Testing issues_

Branch: dpdk-next-eventdev

d3fa7b89f0b893f051cb4cef1cbc961cb59f5721 --> performance testing fail

Test environment and result as below:

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     | -0.052                              |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.017                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.082                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.049                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.089                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.003                               |
+------------+---------+-------------------------------------+

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     | 0.351                               |
+------------+---------+-------------------------------------+
| 128        | 256     | -0.325                              |
+------------+---------+-------------------------------------+
| 256        | 256     | -0.031                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0.039                               |
+------------+---------+-------------------------------------+
| 1024       | 256     | 0.001                               |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.007                               |
+------------+---------+-------------------------------------+

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: 1/6

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 256     | 0.055                               |
+------------+---------+-------------------------------------+
| 128        | 256     | 0.032                               |
+------------+---------+-------------------------------------+
| 256        | 256     | -1.034                              |
+------------+---------+-------------------------------------+
| 512        | 256     | 0                                   |
+------------+---------+-------------------------------------+
| 1024       | 256     | -0.001                              |
+------------+---------+-------------------------------------+
| 1518       | 256     | 0.001                               |
+------------+---------+-------------------------------------+

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/12817/

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