[netperf-talk] Which is the best hardware configuration for Netperf-Server?

[Krishna Kumar2]

Hi Rick,

> Netperf4 is indeed the intended took for concurrent testing. However,
there is a
> way to (ab)use the confidence intervals functionality in netperf2 to be
> reasonably confident that skew error from the lack of synchronization
isn't
> excessive.
>
>
http://www.netperf.org/svn/netperf2/trunk/doc/netperf.html#Using-Netperf-to-

> Measure-Aggregate-Performance

When I run the "recommended" netperf command, I get this output:

# netperf -c -C -t TCP_STREAM -H 10.0.0.2 -i 10
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.2
(10.0.0.2) port 0 AF_INET : +/-2.500% @ 99% conf.
!!! 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      : 11.474%
!!!                       Local CPU util  : 21.881%
!!!                       Remote CPU util : 38.258%

Recv   Send    Send                          Utilization       Service
Demand
Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
Size   Size    Size     Time     Throughput  local    remote   local
remote
bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB
us/KB

 87380  16384  16384    10.00      6401.47   19.40    36.07    0.993
1.835

And for 4 netperfs, the Throughput confidence number shoots upto
100-150% (at the end of this post). What is the reason for this
and how can I get better confidence numbers?

Thanks,

- KK

!!! 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      : 98.061%
!!!                       Local CPU util  : 13.321%
!!!                       Remote CPU util : 17.084%

 87380  16384  16384    10.02      1649.86   28.18    94.69    7.558
26.078
!!! 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      : 68.653%
!!!                       Local CPU util  : 13.178%
!!!                       Remote CPU util : 17.078%

 87380  16384  16384    10.02      1805.35   28.18    94.69    5.789
19.662
!!! 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      : 83.480%
!!!                       Local CPU util  : 13.334%
!!!                       Remote CPU util : 17.100%

 87380  16384  16384    10.02      1678.17   28.18    94.69    6.422
21.321
!!! 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      : 104.539%
!!!                       Local CPU util  : 13.308%
!!!                       Remote CPU util : 17.085%

 87380  16384  16384    10.02      1583.23   28.18    94.70    9.894
35.032