[Discuss-gnuradio] gnuradio and beagle board

[andrea]

Hi,

I'm testing gnuradio with the beagle board.
I'm using:
- gnuradio 3.2.1 (with neon patch).
- libusb-1.0-0

First, I've tried benchmark_dotprod_fff:
# ./benchmark_dotprod_fff
  generic: taps:  256  input: 4e+07  cpu: 1119.820  taps/sec:  9.144e+06 
cortex_a8: taps:  256  input: 4e+07  cpu:   43.391  taps/sec:   2.36e+08 

(and I believe it is ok)

Then, I've tried usrp_benchmark_usb, with very low performance:

./arm-angstrom-linux-gnueabi-usrp_benchmark_usb.py
Testing 2MB/sec... [  718.592163] usb 1-2: USB disconnect, address 2
[  719.116760] usb 1-2: new high speed USB device using ehci-omap and 
address 3
[  719.283386] usb 1-2: configuration #1 chosen from 1 choice
gr_vmcircbuf_createfilemapping: createfilemapping is not available
gr_vmcircbuf_sysv_shm: shmat (2): Invalid argument
usb_throughput = 2M
ntotal    = 1000000
nright    = 994162
runlength = 994162
delta     = 5838
OK
Testing 4MB/sec... usb_throughput = 4M
ntotal    = 2000000
nright    = 1982575
runlength = 1982575
delta     = 17425
OK
Testing 8MB/sec... uUuUuUuUuOuOuOuOuOuOuOuOuOuOuOuOuOuOuOusb_throughput = 8M
ntotal    = 4000000
nright    = 3720433
runlength = 22608
delta     = 3977392
FAILED
Testing 16MB/sec... 
uUuOuUuOuUuOuUuOuUuUuOuUuOuUuOuUuUuOuUuOuUuOuUuUuOuUuOuUuUuOuUuOuUuOuUM
ntotal    = 8000000
nright    = 1934045
runlength = 0
delta     = 8000000
FAILED
Testing 32MB/sec... 
uUuOuUuOuUuOuUuUuOuUuOuUuOuUuUuOuUuOuUuOuUuUuOuUuOuUuOuUuUuOuUuOuUuOuUM
ntotal    = 16000000
nright    = 167550
runlength = 0
delta     = 16000000
FAILED
Max USB/USRP throughput = 4MB/sec

Do you have any suggestion?
thanks

andrea