[Discuss-gnuradio] FreeBSD - more

[LRK]

I'm still in way over my head here but some progress:


usrp_wfm_rcv(_nogui).py runs with either the  Basic Rx or TV Rx board.

Since most of the FM stations are 4 to 6 miles away, it is easy to get
strong signals.

I get uO errors which I think means the USRP is reporting errors sending
bytes in thru the USB path. I get more when running Gnome or xdm than
with the nogui version.


I think the following shows the USRP can send 4Mb/s but anything over 4 Mb
induces overruns:

./test_usrp_standard_rx -M 1
RX d'board A: Basic Rx
RX d'board B: TV Rx
xfered 1.05e+06 bytes in 0.256 seconds. 4.089e+06 bytes/sec. cpu time = 0.008566
noverruns = 0

./test_usrp_standard_rx -M 2
RX d'board A: Basic Rx
RX d'board B: TV Rx
xfered 2.1e+06 bytes in 0.512 seconds. 4.093e+06 bytes/sec. cpu time = 0.0179
noverruns = 0

./test_usrp_standard_rx -M 3.9
RX d'board A: Basic Rx
RX d'board B: TV Rx
xfered 3.15e+06 bytes in 0.768 seconds. 4.094e+06 bytes/sec. cpu time = 0.02703
noverruns = 0

./test_usrp_standard_rx -M 4
RX d'board A: Basic Rx
RX d'board B: TV Rx
rx_overrun
xfered 4.19e+06 bytes in 1.02 seconds. 4.094e+06 bytes/sec. cpu time = 0.03876
noverruns = 1

./test_usrp_standard_rx -M 7.9
RX d'board A: Basic Rx
RX d'board B: TV Rx
rx_overrun
rx_overrun
xfered 7.34e+06 bytes in 1.79 seconds. 4.095e+06 bytes/sec. cpu time = 0.06075
noverruns = 2

./test_usrp_standard_rx -M 8
RX d'board A: Basic Rx
RX d'board B: TV Rx
rx_overrun
rx_overrun
xfered 8.39e+06 bytes in 2.05 seconds. 4.095e+06 bytes/sec. cpu time = 0.06814
noverruns = 2


Disabling the ethernet interface seems to have some small effect on the
overruns while running the wfm code and listening to FM but they still do
hit occasionally and can be heard in the audio.

I am running the "GENERIC" kernel at the moment so there are probably a
few other things turned on that need not be.

The data sheet for my I82801DB chip says it should do 480MB/s using USB 2.0
but that probably really is 60 MBytes/s meaning it should do better than 
the obvious 4MB/s limit I see.


Some of the scripts in the usrp/host/apps use #!/bin/bash and others use
#!/usr/local/bin/bash instead of #!/usr/bin/env bash  as done elsewhere.


Progress but as always clues are welcome.



-- 
LRK
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