Bandwidth measure tools for Gigabit LAN environment

Hi all,

Any suggestions for software tools (windows-/Linux-base) to measure the
bandwidth of a Gigabit LAN environment?

I have tried iperf (v2.0.4) and jperf (v2.0.) With PC to PC direct
link, it gave only 4xx Mbits/sec (depends on the setting on TCP Window.)
It showed 2xx if used the default TCP Window size.

TIA.

--
Wing

Wing <(E-Mail Removed)> wrote:
> Any suggestions for software tools (windows-/Linux-base) to measure
> the bandwidth of a Gigabit LAN environment?

> I have tried iperf (v2.0.4) and jperf (v2.0.) With PC to PC direct
> link, it gave only 4xx Mbits/sec (depends on the setting on TCP
> Window.) It showed 2xx if used the default TCP Window size.

You might consider netperf. http://www.netperf.org/

To get GbE speeds on a back-to-back connection, a TCP window of 128KB
should be sufficient.

You may want to check the CPU utilization of each core on each side
during the test. Also, check netstat stats and ethtool stats to look
for retransmissions and drops. Pull snapshots of those from before
and after the test(s) and run them through beforeafter from
ftp://ftp.cup.hp.com/dist/networking/tools to get the deltas:

beforeafter <before> <after> > delta

rick jones
--
a wide gulf separates "what if" from "if only"
these opinions are mine, all mine; HP might not want them anyway...
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...