Usrp_benchmark_usb.py failed max speed

GNU Radio
1

Hello everyone,

When I run usrp_benchmark_usb.py, the two fastest tests fail, leaving me
with 8 MB/sec maximum. I have two questions:

First, how do I get the 16MB and 32MB tests to pass? Do I need a faster
CPU?

Second, supposing I can’t get a faster system, what is the consequence
of
having a slower maximum speed? Just a smaller bandwidth during
transmitting and receiving?

Jonathan

2

On Tue, Jun 22, 2010 at 11:15 AM, [email protected] wrote:

Hello everyone,

When I run usrp_benchmark_usb.py, the two fastest tests fail, leaving me
with 8 MB/sec maximum. I have two questions:

First, how do I get the 16MB and 32MB tests to pass? Do I need a faster CPU?

Perhaps. What type of system are you running on? Restrictions on the
USB bus may also cause issues.

Second, supposing I can’t get a faster system, what is the consequence of
having a slower maximum speed? Just a smaller bandwidth during
transmitting and receiving?

usrp_benchmark_usb.py is not particularly reliable as a benchmark per
se. But, in general, if your system can’t keep up with the usrp then
you’ll lose packets. Reducing the bandwidth is one way to prevent that
from happening.

Thomas

3

usrp_benchmark_usb.py is not particularly reliable as a benchmark per
se. But, in general, if your system can’t keep up with the usrp then
you’ll lose packets. Reducing the bandwidth is one way to prevent that
from happening.

Thomas

Thomas,
How would you recommend going about benchmarking the system?
Thanks.
-William

4

On Tue, Jun 22, 2010 at 03:09:57PM -0400, William C. wrote:

Thomas,
How would you recommend going about benchmarking the system?
Thanks.
-William

Try using usrp_fft.py, and finding the lowest decimation rate that
works.

Eric