[netperf-talk] Some question about TCP_RR test

[Hangbin Liu]

Hi all,

   I got a network traffic flood in our lab yesterday when I use TCP_RR.
Could you help me answer the questions and find the flood reason?

The cmd is:
"netperf -6 -l 20 -H 2620:52:0:102f:207:43ff:fe10:760 -t TCP_RR -i 10,3
-I 99,5 -r {1,16,32...},1 -s 0 -S 0".
We test the TCP_RR option and set request package from 1 to 4381. And we
often got a warning like:
!!! WARNING
!!! Desired confidence was not achieved within the specified iterations.
!!! This implies that there was variability in the test environment that
!!! must be investigated before going further.
!!! Confidence intervals: Throughput      : 25.119%
!!!                       Local CPU util  : 0.000%
!!!                       Remote CPU util : 0.000%

Local /Remote
Socket Size   Request  Resp.   Elapsed  Trans.
Send   Recv   Size     Size    Time     Rate         
bytes  Bytes  bytes    bytes   secs.    per sec   

2048   256    1        1       20.00    6014.78   
2048   256   

+++++++++++++++++++++++++++++++ Questions +++++++++++++++++++++++++++++++++

1. What's this warning means, does that have any influence for our test output?
2. And what the throughput means? I can't find it from man page and sometimes I
 even got a :
Confidence intervals: Throughput      : 654.493%

why it can exceed 100%, is that have any problems for our lab?

3. What's Trans Rate per sec number means? bits/s, Bits/s, Kb, Mb ???

4. How client performance affect throughput


++++++++++++++++++++++++++++++++++++++ Problem +++++++++++++++++++++++++++++++++

Normally we get the warning from package sizes 256, but this time we got the 
warning from 1. Can you help me find the reason? Thanks!

*Normal test:

Socket Size   Request  Resp.   Elapsed  Trans.
Send   Recv   Size     Size    Time     Rate         
bytes  Bytes  bytes    bytes   secs.    per sec   

2048   256    1        1       20.00    8518.70   
2048   256   
2048   256    16       1       20.00    8269.85   
2048   256   
2048   256    32       1       20.00    8141.42   
2048   256   
2048   256    64       1       20.00    7905.91   
2048   256   
!!! WARNING
!!! Desired confidence was not achieved within the specified iterations.
!!! This implies that there was variability in the test environment that
!!! must be investigated before going further.
!!! Confidence intervals: Throughput      : 10.275%
!!!                       Local CPU util  : 0.000%
!!!                       Remote CPU util : 0.000%

2048   256    128      1       20.00    6650.96   

*Test last night:

!!! WARNING
!!! Desired confidence was not achieved within the specified iterations.
!!! This implies that there was variability in the test environment that
!!! must be investigated before going further.
!!! Confidence intervals: Throughput      : 25.119%
!!!                       Local CPU util  : 0.000%
!!!                       Remote CPU util : 0.000%

Local /Remote
Socket Size   Request  Resp.   Elapsed  Trans.
Send   Recv   Size     Size    Time     Rate         
bytes  Bytes  bytes    bytes   secs.    per sec   

2048   256    1        1       20.00    6014.78   
2048   256   
!!! WARNING
!!! Desired confidence was not achieved within the specified iterations.
!!! This implies that there was variability in the test environment that
!!! must be investigated before going further.
!!! Confidence intervals: Throughput      : 12.254%
!!!                       Local CPU util  : 0.000%
!!!                       Remote CPU util : 0.000%

2048   256    16       1       20.00    6126.77   
2048   256   


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