_Performance Testing issues_

Branch: dpdk-next-virtio

10060dba6455461088d24e03d3cfeba639d53022 --> performance testing fail

Test environment and result as below:

Ubuntu 18.04
Kernel: 4.15.0-generic
GCC: 7.4
NIC: Intel Corporation Ethernet Converged Network Adapter 82599ES 10000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 1/3

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 128     | -17.297                             |
+------------+---------+-------------------------------------+
| 64         | 512     | -0.459                              |
+------------+---------+-------------------------------------+
| 64         | 2048    | 0.057                               |
+------------+---------+-------------------------------------+

Ubuntu 18.04
Kernel: 4.15.0-generic
GCC: 7.4
NIC: Intel Corporation Ethernet Converged Network Adapter XL710-QDA2 40000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 0/2

Detail performance results: 
+------------+---------+-------------------------------------+
| frame_size | txd/rxd | throughput difference from expected |
+============+=========+=====================================+
| 64         | 512     | 0.487                               |
+------------+---------+-------------------------------------+
| 64         | 2048    | 0.318                               |
+------------+---------+-------------------------------------+

https://lab.dpdk.org/results/dashboard/tarballs/7661/

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