[ros-users] Is ROS limiting channel bandwidth over network?

[Ken Conley]

Have you taken the measurement using some other means?  Please note from the
documentation below that "rostopic bw" is not the best means of measuring
this:

"""
http://www.ros.org/wiki/rostopic#rostopic_bw
NOTE: the bandwidth reported is the received bandwidth. If there are network
connectivity issues, or if rostopic cannot keep up with the publisher, the
reported number may be lower than the actual bandwidth. rostopic is
implemented in Python, which cannot maintain as high throughput as
roscpp<http://www.ros.org/wiki/roscpp>-based
nodes.
"""

 - Ken

On Mon, Mar 7, 2011 at 2:21 PM, Sean Anderson <
sean.william.anderson at gmail.com> wrote:

> Hi,
>
> My team is trying to use image_transport compression in order to transfer
> large amounts of image data over our wireless network.
>
> We're using wireless N, but we have been unable to transfer for than 1
> megabyte per sec over the network using ROS.
>
> When using "rostopic bw <channel>" in conjunction we have noticed that the
> bandwidth rises to 2 megabyte per sec (we've seen a max of 4MB/s with
> multiple tabs running the bw check)
>
> A colleague of mine noticed something about wpa_supplicant_node having a
> wireless 11b max bandwidth limiter, is this what is limiting our transfer
> rate? Does anyone know how to unlock the limit?
>
> Thanks so much,
>
> Sean Anderson
>
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