OK, I rebuilt Angstrom with libusb-0.12 ans tested on my Gumstix Overo.
The Overo has a working EHCI host port. (Well after I removed a speck
from the back of the board called R26) Enough about my problems and
eyesight.
Running :
./test_usrp_standard_rx -D 10
xfered 1.34e+08 bytes in 5.27 seconds. 2.547e+07 bytes/sec. cpu time =
3.969
noverruns = 0
./test_usrp_standard_rx -D 256
xfered 1.34e+08 bytes in 134 seconds. 1e+06 bytes/sec. cpu time =
0.2422
noverruns = 0
./test_usrp_standard_tx -I 512
xfered 1.34e+08 bytes in 134 seconds. 1e+06 bytes/sec. cpu time = 5.14
0 underruns
./test_usrp_standard_tx -I 24
xfered 1.34e+08 bytes in 6.29 seconds. 2.133e+07 bytes/sec. cpu time =
5.38
0 underruns
10 is the smallest decimation without overruns and 24 is the smallest
interpolation without underruns. I doubt we can do much at the higher
rates, but the basic numbers look good.
Philip