Re: DAST: Iperf - Huge difference between running iperf -c and iperf -s on Gigabit Ethernet - david --at-- lisas.de (fwd)
On 18/01/07, John S. Estabrook <jestabro --at-- ncsa.uiuc.edu> wrote:
When measuring with iperf, I get approx 600 MBit/s between server and
laptop _both_ ways (running iperf -c server on laptop and iperf -s on
laptop). When running iperf -c server on the desktop to the server I get
only 250 MBit/s, running iperf -s on the desktop gets me 580 MBit/s
between server and desktop.
All three are running Fedora Core 6 i386, except the server which is a
What's your CPU usage like? I often get results like this when running
at 100% CPU.
Try running for at least 30 seconds and then run top to see if 100%
cpu is being used - remember to look at total cpu not just for iperf.
If at 100% then you're probably dropping packets or not transmitting them all.
Ian
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