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Patch provided by Martin Smith. Last July there were several changes made to the Airspy firmware and libairspy that added support for a new bit packing mode where 4 sets of 12 bit samples are packed into 3 sets of 16 bits for the transfer across the USB bus ( https://i.imgur.com/qXnWoEK.png?1 ). 25% less data is transferred across the bus and this is good for some computers with cheap USB chipsets. There is an overhead of extra memory bandwidth required on the host side to unpack the data into a useful format, so for optimal performance bit packing is disabled by default. The data is automatically unpacked within libairspy before being passed along, so no changes are required anywhere else if packing is enabled (or not enabled). Airspy firmware older than v1.0.0-rc6 does not have the function, but that is detected and handled by libairspy. I wrote the attached patch to enable packing in gr-osmosdr, which I tested and it works. It is basically a clone of the bias=0|1 lines as pack=0|1 and calls the needed libairspy function. ref: https://github.com/airspy/firmware/commit/7e1806b https://github.com/airspy/firmware/commit/5b7dcab https://github.com/airspy/host/commit/a51eccb --- Do some Baseline test with Airspy command line tools to have something to compare USB throughput results -------------------------------------------------------------------------------------------------------- $ sudo mount -t debugfs none /sys/kernel/debug $ sudo modprobe usbmon $ wireshark -i usbmod3 & $ airspy_info ; sleep 120 ; \ airspy_rx -t 4 -r /dev/null -n 2400000000 ; sleep 120 ; \ airspy_rx -t 4 -r /dev/null -p 1 -n 2400000000 ; sleep 120 ; \ airspy_info Wireshark->Statistics->IO Graph The Bytes/Tick are double the actual data rate because of way wireshark collects the USB packets, I could have added a filter to fix this. But the relationship is valid 25% less with packing enabled. The data rate in the IO Grahp drops from 80MB/sec (in+out) [really 40MB/sec] to 60MB/second (in+out) [really 30MB/sec] from unpacked to packed. 10MSPS no packing, packing https://i.imgur.com/pA9LPdE.png?1 2.5MSPS no packing, packing https://i.imgur.com/lA8q5aq.png?1 Verification test with my patched gr-osmosdr -------------------------------------------- $ sudo mount -t debugfs none /sys/kernel/debug $ sudo modprobe usbmon $ wireshark -i usbmod3 & $ osmocom_fft -a "airspy=0" -s 10000000 --fft-rate=1 $ osmocom_fft -a "airspy=0,pack=1" -s 10000000 --fft-rate=1 $ osmocom_fft -a "airspy=0" -s 2500000 --fft-rate=1 $ osmocom_fft -a "airspy=0,pack=1" -s 2500000 --fft-rate=1 $ osmocom_fft -a "airspy=0" -s 2500000 --fft-rate=1 $ osmocom_fft -a "airspy=0,pack=0" -s 2500000 --fft-rate=1 I ran all of the above tests and the wireshark USB throughput graphs showed exactly what was expected. 40MB/sec(10MSPS+normal),30MB/sec(10MSPS+packing),10MB/sec(2.5MSPS +normal),7.5MB/sec(2.5MSPS+packing),10MB/sec(2.5MSPS+normal),10MB/ sec(2.5MSPS+normal). 25% less when packing was enabled and if you did not specify the "pack=1", then no bit packing is performed by libairspy. All the magnitudes within the FFT windows looked exactly the same as they do without bit packing.
|7 years ago|
|apps||7 years ago|
|cmake||7 years ago|
|docs||10 years ago|
|grc||7 years ago|
|include/osmosdr||8 years ago|
|lib||7 years ago|
|python||9 years ago|
|swig||8 years ago|
|AUTHORS||7 years ago|
|CMakeLists.txt||7 years ago|
|COPYING||11 years ago|
|MANIFEST.md||8 years ago|
|README||7 years ago|
|gnuradio-osmosdr.pc.in||10 years ago|
While primarily being developed for the OsmoSDR hardware, this block
as well supports:
* FUNcube Dongle through libgnuradio-fcd
* FUNcube Dongle Pro+ through gr-fcdproplus
* sysmocom OsmoSDR Devices through libosmosdr
* RTL2832U based DVB-T dongles through librtlsdr
* RTL-TCP spectrum server (see librtlsdr project)
* MSi2500 based DVB-T dongles through libmirisdr
* SDRplay RSP through SDRplay API library
* gnuradio .cfile input through libgnuradio-blocks
* RFSPACE SDR-IQ, SDR-IP, NetSDR (incl. X2 option)
* AirSpy Wideband Receiver through libairspy
* CCCamp 2015 rad1o Badge through libhackrf
* Great Scott Gadgets HackRF through libhackrf
* Nuand LLC bladeRF through libbladeRF library
* Ettus USRP Devices through Ettus UHD library
* Fairwaves UmTRX through Fairwaves' fork of UHD
* Red Pitaya SDR transceiver (http://bazaar.redpitaya.com)
By using the OsmoSDR block you can take advantage of a common software api in
your application(s) independent of the underlying radio hardware.
For installation and usage guidelines please read the documentation available
For the impatient :) a short excerpt:
The Gnu Radio block requires a recent gnuradio (>= v3.7) to be installed.
Before building the block you have to make sure that all the dependencies
(see list of supported devices above) you are intend to work with are
properly installed. The build system of gr-osmosdr will recognize them and
enable specific source/sink components thereafter.
Please note: prior pulling a new version from git and compiling it,
please do a "make uninstall" first to properly remove the previous version.
Building with cmake:
git clone git://git.osmocom.org/gr-osmosdr
sudo make install
NOTE: The osmocom blocks will appear under 'Sources' and 'Sinks' categories
in GRC menu.