[netperf-talk] TCP_RR not returning results

[Rick Jones]

Shwetabh wrote:
> 
> 
> 
> Rick Jones wrote:
> 
>> When you say did not stop - you mean it was still generating traffic, 
>> or simply didn't emit a result?
>>
>>> After this, no output was given. I hope this helps with the diagnosis.
>>> Please let me know if any more information is needed.
>>
>>
>> A system call trace after the elapsed time could help
>>
>>
>> thanks,
>>
>> rick jones
>>
> 
> Hi,
> 
> I started the TCP_RR test for 12 hours. After 12 hours, the test still 
> did not stop.
> Then I ran strace for the process. Here's the output:
> 
> [root at localhost ~]# strace -p 5709
> Process 5709 attached - interrupt to quit
> recvfrom(4, "", 1, 0, NULL, NULL)       = 0
> recvfrom(4, "", 1, 0, NULL, NULL)       = 0
> recvfrom(4, "", 1, 0, NULL, NULL)       = 0
> recvfrom(4, "", 1, 0, NULL, NULL)       = 0
> recvfrom(4, "", 1, 0, NULL, NULL)       = 0
> recvfrom(4, "", 1, 0, NULL, NULL)       = 0
> recvfrom(4, "", 1, 0, NULL, NULL)       = 0
> recvfrom(4, "", 1, 0, NULL, NULL)       = 0
> recvfrom(4, "", 1, 0, NULL, NULL)       = 0
> 
> I hope this information helps. Please let me know if some other info is 
> needed.

It should - this on netperf or netserver?

Interesting - looks like the code is posting a single-byte recv as 
expected, getting a zero byte return, and ignoring it.  That keeps it in 
the loop trying to complete a transaction.

rick