Re: [Discuss-gnuradio] USB performance and Win32

[Eric Blossom]

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

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