[netperf-talk] concurrent sessions with Netperf 2.4.2

[Rick Jones]

anil mishra wrote:
> Hi all,
> I was trying to do some benchmarking to run the concurrent sessions. It 
> does  not seem to run the seesions concurrently. Am I missing something?

Canyou tell us the specific set of command line options and shell stuff 
you were using to get concurrent sessions?

> I tried to run TCP_RR using Netperf and got the result as around ~18000 
> TPS for 1 byte request/response size which gives me latency as around 
> ~50 usec.
> 
> Then I tried to run the latency test using Iperf 2.0.2 for 1 byte data 
> transfer and that gives me the number something like 124 KBytes/s which 
> gives me the latency around 7.8 usec. I am not sure why so  much of 
> difference there in Iperf and Netperf numbers.

I think Andrew already addressed that.  To expand on it, those single 
byte sends, unless and perhaps even if you set TCP_NODELAY with some 
iperf option, were likley bundled-up into larger TCP segments and you 
were not running a latency test.

If you were to run:

netperf -t TCP_STREAM -H <remote> -- -m 1

I suspect you would get a result similar to that of iperf's.

rick jones