perfSONAR User Q&A and Other Discussion

[Brian Tierney <>]

On Feb 15, 2012, at 11:12 AM, Joseph Bernard wrote:

> I replaced the Broadcom with an Intel Gigabit CT Desktop Adapter card and
> got the same results.  I then noticed that the version of iperf on CentOS
> 5.7 I've been using is 2.0.4 instead of 2.0.5.  I loaded up PS-PS and
> replaced 2.0.5 with 2.0.4.  I am now getting 950Mb/s on UDP.  I was using
> 2.0.5 on my Macs for testing.  I compiled 2.0.4 and went from 800Mb/s to
> 900Mb/s. So it looks like iperf is the problem here.

Interesting, and good to know. iperf 2.0.4 had some problems with not 
shutting down cleanly that were fixed in 2.0.5, so thats why the version
on the perfSONAR toolkit is 2.0.5.

FWIW, for UDP testing, I switched to nuttcp about 1 year ago, as I find the 
results much more reliable than iperf.