[netperf-talk] netperf error message during thin streams

[Rick Jones]

Jon Pedersen wrote:
> Hi!
> 
> I'm sending thin streams with netperf. Send socket size = 100 bytes with 
> netperf parameters -w 1000 and -b 4. I'm running 10 consecutive tests 
> for 30 min each.

Please provide a cut and paste of the exact command line - "send socket size = 
100 bytes" sounds like -s 100, but do you really mean netperf message size of 
100 bytes -m 100?

> Some of the tests completed successfully, while the rest failed at some 
> point during execution with the following error message:
> 
> netperf: receive_response: no response received. errno 4 counter -1
> 
> 
> What is causing this error and how can it be avoided?

Netperf was expecting to receive a message from netserver via the control 
connection, but no response was received within the select timeout (IIRC two 
minutes).  99 times out of 10 it means the remote netserver died for some reason.

> Why do some tests fail while the rest complete succesfully?

It depends :)  I would start by looking for stuff in /tmp/netperf.debug on the 
netserverside, and perhaps anything that might have ended-up in syslog or 
whatnot. Also, look for core files from netserver.

happy benchmarking,

rick jones