USB performance and Win32

GNU Radio
1

Good news, got a basic test version of gnuradio compiled in MSVC 2005,
included a C# front end. More details can be found on the
http://www.gnuradio.org/trac/wiki/WindowsNativeInstall page. Most of
the
key C++ code is in there, it will just need more managed interfaces
built.
Right now, it can do one thing and one thing only so far, and that’s to
run
a clone of the usrp_benchmark_usb.py code.

It runs without error, but can’t exceed 8Mbps. On the same machine
running
Cygwin, it gets the full 32Mbps. The CPU utilization is similar between
the
two versions, under 10%.

The only thing I can see that’s different about how the code is running
is
that the MSVC version uses the createfilemapping circular buffer, while
cygwin (I think?) uses MMAP. Have there been any problems noted with
createfilemapping?

Geof

2

On Tue, May 06, 2008 at 12:35:19AM +0900, Geof Nieboer wrote:

The only thing I can see that’s different about how the code is running is
that the MSVC version uses the createfilemapping circular buffer, while
cygwin (I think?) uses MMAP. Have there been any problems noted with
createfilemapping?

Geof

No problems that I know of.

Which FUSB_TECH are you selecting? It’s normally computed in
config/usrp_fusb_tech.m4
I suspect you may be getting FUSB_TECH_generic. Try FUSB_TECH_win32.

Eric

3
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