Re: [Discuss-gnuradio] FreeBSD - more

[Berndt Josef Wulf]

On Thu, 13 Oct 2005 17:05, Eric Blossom wrote:
> > I believe it was gnuradio-examples/python/usrp/benchmark_usb.py that
> > triggered the problem here.
> >
> > cheerio Berndt
>
> That should be the right answer, but is not completely reliable.
>
> Try running test_usrp_standard_rx with different values of the
> -D <decim> option.  Start with -D 128, then try -D 64, -D 32, -D 16, -D 8.
>
>   -D 128    500kS/sec      2MB/sec
>   -D  64    1MS/sec        4MB/sec
>   -D  32    2MS/sec        8MB/sec
>   -D  16    4MS/sec       16MB/sec
>   -D   8    8MS/sec       32MB/sec
>
> Likewise, try test_usrp_standard_tx with different values of the
> -I <interp> option.  Start with -I 256, then try -I 128, 64, 32, 16.
>
>   -I 256    500kS/sec     2MB/sec
>   -I 128    1MS/sec       4MB/sec
>   -I  64    2MS/sec       8MB/sec
>   -I  32    4MS/sec      16MB/sec
>   -I  16    8MS/sec      32MB/sec
>
>
> A couple of over/run-runs at the beginning is OK for any given attempt.
>
> (Note, I just fixed a minor problem that would show 5 or more
> tx_underruns at the beginning.   Update usrp from CVS if you want the fix.)

On NetBSD benchmark_usb.py manages 8MB/sec whilst test_usrp_standard_XX stands 
up to 4MB/sec on NetBSD. I would be interested to see what FreeBSD can 
produce, although I suspect it will be the same on similar hardware.

cheerio Berndt

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