iperf (2.0.5) vs iperf3 on 10G Ethernet

[bmah888]

From DhruvDesaai on December 06, 2013 02:40:11

What steps will reproduce the problem? 1. On a 10 G link,
a) iperf -c -P
b) iperf3 -c -P What is the expected output? What do you see instead? a) iperf 2.0.5 saturates the link and give o/p of 9.5 - 9.9 Gbps
b) iperf3 fails to saturate the network. Best figure ranges in 6.5 to 7 Gbps What version of the product are you using? On what operating system? iperf version 2.0.5 (08 Jul 2010) pthreads
iperf version 3.0-BETA5 (28 March 2013)

uname -a o/p
Linux **** 2.6.32-220.el6.x86_64 #1 SMP Tue Dec 6 19:48:22 GMT 2011 x86_64 x86_64 x86_64 GNU/Linux Please provide any additional information below. Test setup: Two machines, each with 16 cores and 64 GB RAM with above kernel are connected back to back.

Original issue: http://code.google.com/p/iperf/issues/detail?id=123

[bmah888]

From bltierney@es.net on December 06, 2013 06:08:22

already done

Status: WontFix

[bmah888]

From DhruvDesaai on December 11, 2013 01:11:04

We tried with the latest version of iperf3, but still the problem persists.

iperf3 is not saturating 10G, while iperf v 2.0.5 can