Re: IPerf 2.0.8 Dualtest

Hi,

100Mbps is a maximum. TCP puts a bit of protocol and processing overhead on it. 86.6Mbps is whit I would
expect from a couple of 100MBps Ethernet cards running on a cheep layer 2 (simple) switch. Try running the
test for longer (to overcome slowstart) or use UDP (which has less over head and no slow start) then number
will be closer to 100mbps.

Slowstart should not be two much of a problem on a LAN as the latency will be quite low.

Also after changing the tcpwindow size you need to restart networking services on both computers for the
change to TCP window to take effect (depending on your stack implementation). Restart the computer if you
are unsure over how to do this.

Regards,

Owain

-----Original Message-----
From: Frank Schuster [mailto:frank.schuster01@...] 
Sent: 23 October 2009 08:32
To: iperf-users@...
Subject: [Iperf-users] IPerf 2.0.8 Dualtest

Hello,

I have done a dualtest with iperf:
On server I execute: iperf -s
And on client: iperf -c <server_ip> -d

The output shows me in addition more bandwidth than my network (100MBit/s) has: