[netperf-talk] problem with netperf

[Rick Jones]

[Lets keep the discussion on list please as I suspect it may help others later]

Md Hedayetul Islam wrote:
> Hello 
> Thanks for your mail.
> Actullay I am going to use netperf to measurement data transfer rate 
> from my nerperf client.
> I have installed netperf server on my ubuntu server and netperf client 
> on ubuntu client.
> My netperf client is connected with 3G modem(CDMA) and netserver is 
> another publice ip.
> I can ping my netserver from netclient.
> when i using UDP_STREAM through netperf  i am getting few info.but when 
> trying to TCP_STREAM getting that error.

I'm going to take a wild guess that with the default socket settings and such, 
the stack allows netperf to queue-up so much data, it has the netserver's test 
timer expire before the test is actually over.

One way to test this hypothesis is to limit the socket buffer sizes with -s and 
-S options and disable linux's autotuning of the socket buffer/window.  So, 
something akin to

netperf -p 4555 -H 109.123.82.189 -- -m 2048 -s 32K -S 32K

or, since this is a TCP_STREAM test, you could control the test by byte count 
rather than by time and avoid the netserver timer:

netperf -p 4555 -H 109.123.82.189 -l -10M -- -m 2048

note the minus in front of the 10M - if you omit it, netperf will try to run for 
10 megaseconds (M == 1048576).  Use m if you want powers of 10.

If that is not sufficient, it may be necessary to re ./configure with 
--enable-intervals and ask netperf to pace its send() calls.

happy benchmarking,

rick jones

> 
> please help as soon as possible
> 
> Thanks
> hedayetul
> 
> On Tue, Jan 18, 2011 at 8:00 PM, Rick Jones <rick.jones2 at hp.com 
> <mailto:rick.jones2 at hp.com>> wrote:
> 
>     Md Hedayetul Islam wrote:
> 
>         I am new in netperf.I just need to data transfer rate from my
>         netperf client to netserver.
>         can u please send me that how to do that?
>         when i use this command got that error.
> 
>         netperf -p 4555 -H 109.123.82.189 -- -m 2048
>         TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
>         109.123.82.189 (109.123.82.189) port 0 AF_INET
>         Interrupted system call
>         netperf: remote error
>         4oxyfi at test-laptopA:/usr/local/bin/netperf-2.4.5$
> 
> 
> 
>     We need to know a great deal more about your situation.  What sort
>     of link joins the two systems?  What sort of systems are the two
>     systems?  Any particular reason you chose to run netserver on a
>     different port number for the control connection? Etc etc...
> 
>     happy benchmarking,
> 
>     rick jones
> 
>