perfSONAR User Q&A and Other Discussion

Dear all,

Possibly it is caused by "-O 5" option passed to bwctl.
Bwctl will pass "-O 5" to iperf3.

This option is used to ignore data during initial 5 seconds
to reduce the effect of TCP slow start.
Then additional 5 seconds are needed to the time duration specified by "-t".

You can check whether "-O" is specified or not by ps command.
I have same problem, but the "-O" option appears only for the test
generated from mesh.

If 3.4.2 is cleanly installed, the bwctl.limits file permits 60 seconds.
So some pair will meet this problem, and other pare will not.

regards,
Soh Y. Suzuki

On 2015/04/09, at 17:34, "Garnizov, Ivan (RRZE)" 
<>
 wrote:

> Dear Roderick,
> 
> Unfortunately, I am unable to reproduce your problem.
> Please first specify versions of the tools you use: toolkit and iperf!
> 
> Then please explain, where do you set the bwctld.limits file with 35s. Both 
> sides or just destination...or source, so that we do not have to guess.
> 
> It would be helpful for us to make the same test from our systems, if you 
> are willing to provide us with the information about the hosts themselves 
> as well.
> 
> The subject of the message is also signifying that something was working 
> and then stopped, but we have no idea, based on what changes the error was 
> introduced.
> 
> Best regards,
> Ivan
> 
> -----Original Message-----
> From: 
> 
>  
> [mailto:]
>  On Behalf Of Roderick Mooi
> Sent: Thursday, April 09, 2015 9:19 AM
> To: perfsonar-user
> Cc: Kevin Draai
> Subject: [perfsonar-user] bwctl scheduled 30 second tests stopped working
> 
> Greetings
> 
> Recently our scheduled tests stopped working. We noticed lines like these 
> in owamp_bwctl.log:
> 
> bwctld[19119]: FILE=endpoint.c, LINE=1310, PeerAgent: Peer cancelled test 
> before expected
> 
> Further investigation: Our tests are scheduled for 30s each and although 
> bwctld.limits has duration=30, testing manually revealed that the tests are 
> being rejected.
> 
> Changing either the limits file to duration=35 or our test duration to 25s 
> resolved the problem. 
> 
> Any explanations?
> 
> Thanks,
> 
> Roderick
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