perfSONAR User Q&A and Other Discussion

[Jason Zurawski <>]

Hi Jim;

On 12/13/10 7:53 PM, jim warner wrote:
> On the Service Graphs / Throughput screen there are some mystery columns.
>
> One is "Bandwidth Limit" What is this? Under what circumstances would
> there be numbers in this column?


If you configured a UDP BWCTL (Bandwidth) test there is an option to 
limit the total bandwidth used.  This field would be populated with the 
value you entered.


> The other is "Bi-directional". This word is not to be found in the
> on-line documentation.


This field indicates if BWCTL was able to test bandwidth in each 
direction: from your host to the remote host, and from the remote host 
to your host.  I will add both of these clarifications to the FAQ.


> I've got one test that claims "No" as the answer to bi-directional, and
> I can't find where this is set or controlled. Assuming I set up a
> uni-directional test (I don't remember doing this), I have seen the
> error of my ways and I want to test both directions. Where is the knob?


The default setting is to test in both directions.  If you see a 'no' 
value, one direction of the test is failing for some reason.  Common 
reasons are firewalls, NTP synchronization, host permissions, or the 
host simply being 'busy' and not having a test slot available.  I would 
suggest doing this as a first step (from the terminal):

 bwctl -c REMOTE_HOST
 bwctl -s REMOTE_HOST

This will test both directions of the test, if these both succeed we can 
debug further.

Thanks;

-jason

> This is version 3.2.
>
> Thanks.