_Performance Testing issues_

Branch: dpdk-next-net-mlx

0cbd2c5cea5ca68679078712f17d04da2e3f75cf --> performance testing fail

Test environment and result as below:

Ubuntu 18.04
Kernel: 4.14.122
GCC: 7.3.0
NIC: NXP LS2088A 10000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 1/2

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 512     | 0.497                               |
+------------+---------+-------------------------------------+
| 64         | 2048    | -1.243                              |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/7657/

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