Could I be removed from this distribution list?
Thanks,
Marta
> From: jdu...@es.net
> To: iperf-users@lists.sourceforge.net
> Date: Wed, 23 Mar 2011 18:39:48 -0500
> Subject: Re: [Iperf-users] Question reg iperf server reports
>
> Excerpts from Vasanthy Kolluri (vkolluri)'s message of Mon Mar 21 13:49:45
> -0500 2011:
> > I have two iperf clients sending UDP packets to a iperf server. Once the
> > test is completed, the Server side results for only one of the streams
> > is reported both on the client and server.
> >
> >
> >
> > Iperf client:
> >
> >
> >
> > # iperf -c 10.0.50.100 -B 10.0.50.1 -u -b1G -t100 &
> >
> > # iperf -c 10.0.50.100 -B 10.0.50.2 -u -b1G -t100 &
>
> This isn't the common way to do multiple streams with Iperf and I suspect the
> code won't deal with this gracefully. In this case I believe Iperf is
> silently failing. Iperf3 handles this case by only allowing one client at a
> time and rejects other clients until tests are complete.
>
> Are you running the two client processes on different machines or the same
> machine? I see that you're binding (-B) to two different IP addresses but
> that could be two NICs on the same machine or could be on different machines.
>
> If you are running on two machines you'll be best off starting two Iperf
> servers on the server end, eg:
>
> iperf -u -s -p 5001
> iperf -u -s -p 5002
>
> and then on each of the client machines doing:
>
> iperf -c 10.0.50.100 -u -b1G -t100 -p 5001
> iperf -c 10.0.50.100 -u -b1G -t100 -p 5002
>
> If both clients are on the same machine you can do:
>
> iperf -c 10.0.50.100 -u -b1G -t100 -P2
>
> (just use your original Iperf invocation on the server side)
>
> The -P flag spawns 2 threads each trying to send at 1G/s.
>
> Modern hardware should have no trouble doing 2 x 1G UDP streams on a 10G NIC.
> It's often hard to get UDP working faster than 8-9G/s for a variety of
> reasons as you usually end up buring a lot of CPU to receive them.
>
> Hope that helps,
>
> Jon
>
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