[netperf-talk] How to fix the following error message ?

[Rick Jones]

Lei Lu wrote:
> Hi folks,
> 
> I am trying to measure the cpu overhead when the system is sending out 
> packets with certain rates. To control the packets sending rate, I use 
> the following command (by changing -b values):
> 
> " netperf -t UDP_STREAM -H 172.16.2.150 -b 120 -l 300 -w 10 -- -m 1400 
> -s 256K -S 256K" (12000pkts/sec)
> 
> I have to use the packet size as max as possible, so I choose 1400 in 
> this case.
> 
> The problem is that when I increase the -b values, the following error 
> message begin to show up:
> 
> "UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 
> 172.16.2.150 (172.16.2.150) port 0 AF_INET : interval
> netperf: receive_response: no response received. errno 4 counter -1"
> 
> What could be the reason of this error message? How should I fix this 
> one and continue with my works or is there any pass away method ?

The message suggests that when netperf was expecting a response on the control 
connection there was none.  I cannot say with certainty what the errno 4 as that 
number's meaning can (iirc) vary from platform to platform.

It is imporatant to make sure that the version of netperf and netserver match at 
each end.  I'm also curious to know if the error happens without the -b and -w 
options present or at different values.

happy benchmarking,

rick jones

> Thanks in advance for any thoughts!
> Lei
> 
> 
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