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Diffstat (limited to 'host/docs')
| -rw-r--r-- | host/docs/usrp2.rst | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/host/docs/usrp2.rst b/host/docs/usrp2.rst index 092332442..dfde06b27 100644 --- a/host/docs/usrp2.rst +++ b/host/docs/usrp2.rst @@ -117,6 +117,17 @@ Run the following commands: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Debugging networking problems ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +**Disable the firewall:** +If uhd_find_devices gives you nothing +but uhd_find_devices --args addr=192.168.10.2 yeilds a discovered device, +then your firewall may be blocking replies to UDP broadcast packets. + +**Ping the USRP2:** +The USRP2 will reply to icmp echo requests. +:: + + ping 192.168.10.2 + **Monitor the USRP2:** You can read the serial port on the rear of the USRP2 to get debug verbose from the embedded microcontroller. @@ -126,3 +137,38 @@ MAC addresses, control packets, and fast-path settings. **Monitor the host network traffic:** Use wireshark to monitor packets sent to and received from the USRP2. + +------------------------------------------------------------------------ +Resize the send and receive buffers +------------------------------------------------------------------------ +It may be useful increase the size of the socket buffers to +move the burden of buffering samples into the kernel, or to +buffer incoming samples faster than they can be processed. +However, if you application cannot process samples fast enough, +no amount of buffering can save you. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Device address params +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +To set the size of the buffers, +the usrp2 will accept two optional parameters in the device address. +Each parameter will accept a numeric value for the number of bytes. + +* recv_buff_size +* send_buff_size + +Example, set the args string to the following: +:: + + addr=192.168.10.2, recv_buff_size=100e6 + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +OS specific notes +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +On linux, the maximum buffer sizes are capped by the sysctl values +**net.core.rmem_max** and **net.core.wmem_max**. +To change the maximum values, run the following commands: +:: + + sudo sysctl -w net.core.rmem_max=<new value> + sudo sysctl -w net.core.wmem_max=<new value> |