In review process, reviewer need to check bw_tcp value to see the real transfer rate. If the transfer rate is much lower than the naming speed, we need to double check with vendor.

In cert#828100, v7 report the transfer rate for QDR device is about 4MBps:
TCP latency using 10.0.0.10: 0.0940 microseconds
testing bandwidth to 10.0.0.10...
0.065536 408.99 MB/sec


And vendor reports when he run tests manually as following steps, return value of bw_tcp can reach 2.1GBps. And iperf return value is 27 MBit/sec. 
[root@SA2260-X9DR3-LN4F ~]# bw_tcp -m 65520 -P 8 10.0.0.10
0.065520 2166.37 MB/sec
For detail please refer to https://hardware.redhat.com/show.cgi?id=828100#c45

steps is belowing, for detail please refer to https://hardware.redhat.com/show.cgi?id=828100#c47:
- set CONNECTED_MODE=yes and MTU=65520 in
/etc/sysconfig/network-scripts/ifcfg-ib0 (for both server and test system)
- set the governor to performance in /etc/sysconfig/cpuspeed
- bound the process qib_cq to a specific CPU core with 'taskset -pc 3 $(pidof
qib_cq)' on both server and client

Can network test be improved to reflect max real value?