Also, nuttcp is also generating a very low bandwidth i.e. 86Mbits/sec, between my PC and 7390. Although the CPU is only 60% utilised versus 98% for iPerf!
PC -----------------------------------
C:\Users\Peter\My Apps\NutTCP>nuttcp -T60 192.168.0.1
614.4375 MB / 60.00 sec = 85.9024 Mbps...