USRP underrun and overrun

Hi, I get fixed the errors and compiled gnuradio on Ubuntu 11.04 on a
notebook.

I get the following errors about for usrp_benchmark_usb.py.
Is it the problem about USB? I don’t know how to know my USB is running
2.0.

HP-Compaq-6535s:~/gnuradio/gnuradio-examples/python/usrp$
./usrp_benchmark_usb.py
Testing 2MB/sec…
/home/howie/.gnuradio/prefs/gr_vmcircbuf_default_factory:
No such file or directory
gr_vmcircbuf_createfilemapping: createfilemapping is not available
uUuOuUuOuUuOuUuOuUuOuUuOuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuOuUuUuUuUuUuUusb_throughput
= 2M
ntotal = 1000000
nright = 953366
runlength = 37404
delta = 962596
FAILED
Testing 4MB/sec…
uOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuUuUuUuUuU^Cusb_throughput
= 4M
ntotal = 2000000
nright = 1907110
runlength = 75805
delta = 1924195
FAILED
Testing 8MB/sec…
uUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuOuUuUuUuUuUuUuUuUuUuUuUuUuUuUuUuUuUuUusb_throughput
= 8M
ntotal = 4000000
nright = 3883563
runlength = 38818
delta = 3961182
FAILED

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