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Diffstat (limited to 'host/docs/usrp2.rst')
| -rw-r--r-- | host/docs/usrp2.rst | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/host/docs/usrp2.rst b/host/docs/usrp2.rst index 09987b3fa..aff0d0454 100644 --- a/host/docs/usrp2.rst +++ b/host/docs/usrp2.rst @@ -158,10 +158,25 @@ 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. +By default, the UHD will try to request a reasonably large buffer size for both send and receive. +A warning will be printed on instantiation if the actual buffer size is insufficient. +See the OS specific notes below: + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +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> + ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Device address params ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -To set the size of the buffers, +To manually 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. @@ -172,14 +187,3 @@ 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> |