Hi, if I executed "iperf -c 10.10.10.1 -fm -t 600 -i 60 -u -b 500m" in a virtual-machine with GigE vNIC, then Iperf client(version 2.0.5) under Debian sent traffic at 120Mbps during all the intervals. If I replaced the OS in virtual-server with CentOS, the same Iperf release with the same command was able to send traffic at 500Mbps. Does Iperf client count packets it successfully manages to send and calculates the amount of data sent by knowing the datagram size? What are the theoretical possibilities to low bandwidth rate printed by Iperf client other than very little CPU time(Iperf process is not able to send out packets with sufficient rate)?
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