opensand team mailing list archive

[Julien BERNARD <jbernard@xxxxxxxxxxxxxxxxxxx>]

Hi François and Jonas,

> We have carried out some test on opensand 3.0 and we have already 
> obtained strange results.
> Indeed we have made a ping sending 500 Bytes each 4ms from a terminal 
> to the gateway (equivalent to an average throughput of 1Mb/s in 
> theory) and with the collector we have observed the attached plots 
> showing an average throughput of about 0.5Mb/s.
> The command we are using for the ping is:
> ping -s 500 -i 0.004 192.168.42.3 -c 1000
Please capture your incoming traffic with Wireshark and check your 
throughput. I'm pretty sure that the ping command does not support 
sending packets with an interval of 0.004 second.

> Moreover in each test we have launched, there is a strange peak at 
> 6000000 kb/s at the beginning of the simulation in the throughput 
> signal between the terminal and the satellite emulator, I think it 
> must be an error in the opensand-collector.
There should be an error with initial statistics, I will investigate on 
that.
Could you please check the file where this statistic is saved to tell me 
if you find the 6000000 value in it (else this is a manager problem). 
The file should be in 
~/.opensand/default/<your_run_id>/st1/st/Throughputs.L2_from_SAT.csv

> Another question : since we have sent 1000 paquets every 4ms, the 
> expected simulation time must be 4s. However the simulation lasts 8s, 
> according to the collector. 
This confirms the ping problem.

Regards,

--
Julien BERNARD