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Bandwidth clarification require - urgent answer require for customer #149

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
What steps will reproduce the problem?
1. Send single stream from client with 20 MB bandwidth
2. Receive the stream on Server
3.Monitor bandwidth how much send and receive

What is the expected output? What do you see instead?
I want to know if 20MB will receive or its fine i am getting 19.3 MB

What version of the product are you using? On what operating system?
iperf 2.0.5 on buntu10.

Please provide any additional information below.

I am using iperf for first time for my customer. I want to ask a question 
regarding iperf bandwidth calculation. 
I am using UDP port and sending 20 MB bandwidth over ethernet from client side. 
I can see client is sending all 20 MB but on server side I received only around 
19.3 MB so I want to know why I am loosing this  0.7 MB bandwidth ? Is there 
any overheard or something kindly explain me in detail as I want to argue this 
with customer. See attached figures.

Original issue reported on code.google.com by Sheharya...@gmail.com on 22 Mar 2014 at 9:47

Attachments:

GoogleCodeExporter commented 8 years ago 
My customer project is on hold for this question. So kindly answer me about as 
soon as you can.

Original comment by Sheharya...@gmail.com on 22 Mar 2014 at 9:49

GoogleCodeExporter commented 8 years ago 

You are almost certainly hitting CPU limitations. Have you checked your CPU 
usage?

We recommend nuttcp for UDP testing. It does much better for UDP:
http://fasterdata.es.net/performance-testing/network-troubleshooting-tools/nuttc
p/

Original comment by bltier...@es.net on 22 Mar 2014 at 1:57

GoogleCodeExporter commented 8 years ago 
So u mean i ahould receive full 20 mb on server side ? What about any overhead, 
ip header frame size?

Original comment by Sheharya...@gmail.com on 22 Mar 2014 at 2:21

GoogleCodeExporter commented 8 years ago 
Note this is an issue for iperf version 2, not iperf version 3.  This Web page 
is an obsolete (not to be used anymore) issue tracker for iperf 3.  No issues 
should be filed on the issue tracker on this page.  iperf 3 bug reports should 
be filed at:

https://github.com/esnet/iperf/issues

This seems more a question about usage of iperf 2 (or the jperf front-end to 
same).  I recommend posting this question to the iperf-users mailing list.

Closing this as invalid.

Original comment by bmah@es.net on 22 Mar 2014 at 3:34

GoogleCodeExporter commented 8 years ago 
Can u send me latest link for Iperf3. I tried to download iPerf 3.0.2 but when 
i unzip it says invalid. ALso cdo you link to latest version of jPerf which is 
compatible with iperf3.

Original comment by Sheharya...@gmail.com on 22 Mar 2014 at 10:07

GoogleCodeExporter commented 8 years ago 
The iperf 3.0.2 tar ball is (mistakenly) not a compressed tar ball, despite its 
.tar.gz extension.  If you rename the file or just un-tar it, it should work 
just fine.

Please do not file any more issues or comments to this issue tracker.  Please 
use this issue tracker instead for iperf3 bugs:

https://github.com/esnet/iperf/

Original comment by bmah@es.net on 24 Mar 2014 at 6:18