What does your CPU, load average, other IO load look like on both machines? It could be limited by the compression instead of the throughput. <br><br>Tully<br><br><div class="gmail_quote">On Mon, Mar 7, 2011 at 2:52 PM, Sean Anderson <span dir="ltr"><<a href="mailto:sean.william.anderson@gmail.com">sean.william.anderson@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">We've been watching on the system monitor of both machines<br><br>We just subscribed to the raw channels instead of the compressed and we're seeing a transfer rate of up to 8MB/s on the system monitor instead of 1MB/s, so the problem has something to do with the compression<br>
<br>any ideas?<div><div></div><div class="h5"><br><br><div class="gmail_quote">On Mon, Mar 7, 2011 at 5:27 PM, Ken Conley <span dir="ltr"><<a href="mailto:kwc@willowgarage.com" target="_blank">kwc@willowgarage.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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:<br><br>"""<br><a href="http://www.ros.org/wiki/rostopic#rostopic_bw" target="_blank">http://www.ros.org/wiki/rostopic#rostopic_bw</a><br>
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 <a href="http://www.ros.org/wiki/roscpp" target="_blank">roscpp</a>-based nodes. <br>"""<br><br> - Ken<br><br><div class="gmail_quote"><div><div></div><div>On Mon, Mar 7, 2011 at 2:21 PM, Sean Anderson <span dir="ltr"><<a href="mailto:sean.william.anderson@gmail.com" target="_blank">sean.william.anderson@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div><div></div><div>Hi,<br><br>My team is trying to use image_transport compression in order to transfer large amounts of image data over our wireless network.<br>
<br>We're using wireless N, but we have been unable to transfer for than 1 megabyte per sec over the network using ROS.<br>
<br>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)<br><br>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?<br>
<br>Thanks so much,<br><font color="#888888"><br>Sean Anderson<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Tully Foote<br>Systems Engineer<br>Willow Garage, Inc.<br><a href="mailto:tfoote@willowgarage.com">tfoote@willowgarage.com</a><br>(650) 475-2827<br>