Measuring Bandwidth Usage
On the FRC® Field each team is allocated limited network bandwidth (see R704 in the 2022 manual). The FMS Whitepaper provides more information on determining the bandwidth usage of the Axis camera, but some teams may wish to measure their overall bandwidth consumption. This document details how to make that measurement.
Teams can simulate the bandwidth throttling at home using the FRC Bridge Configuration Utility with the bandwidth checkbox checked.
Measuring Bandwidth Using the Performance Monitor (Win 7 only)
Windows contains a built-in tool called the Performance Monitor that can be used to monitor the bandwidth usage over a network interface.
Launching the Performance Monitor
Start and in the search box, type
perfmon.msc and press Enter.
Open Real-Time Monitor
In the left pane, click
Performance Monitor to display the real-time monitor.
Add Network Counter
Click the green plus near the top of the screen to add a counter
In the top left pane, locate and click on
Network Interfaceto select it
In the bottom left pane, locate the desired network interface (or use All instances to monitor all interfaces)
Add>>to add the counter to the right pane.
OKto add the counters to the graph.
Remove Extra Counters
In the bottom pane, select each counter other than
Bytes Total/sec and press the
Delete key. The
Bytes Total/sec entry should be the only entry remaining in the pane.
Configure Data Properties
Press Ctrl+Q to bring up the Properties window. Click on the dropdown next to
Scale and select
1.0. Then click on the
Configure Graph Properties
Maximum Box under
Vertical Scale enter 917504 (this is 7 Megabits converted to Bytes). If desired, turn on the horizontal grid by checking the box. Then click
OK to close the dialog.
Viewing Bandwidth Usage
You may now connect to your robot as normal over the selected interface (if you haven’t done so already). The graph will show the total bandwidth usage of the connection, with the bandwidth cap at the top of the graph. The Last, Average, Min and Max values are also displayed at the bottom of the graph. Note that these values are in Bytes/Second meaning the cap is 917,504. With just the Driver Station open you should see a flat line at ~100000 Bytes/Second.
Measuring Bandwidth Usage using Wireshark
If you are not using Windows 7, you will need to install a 3rd party program to monitor bandwidth usage. One program that can be used for this purpose is Wireshark. Download and install the latest version of Wireshark for your version of Windows. After installation is complete, locate and open Wireshark. Connect your computer to your robot, open the Driver Station and any Dashboard or custom programs you may be using.
Select the interface and Start capture
In the Wireshark program on the left side, select the interface you are using to connect to the robot and click
Open Statistics Summary
Let the capture run for at least 1 minute, then click
View Bandwidth Usage
Average bandwidth usage, in Megabits/Second is displayed near the bottom of the summary window.