Re: [Discuss-gnuradio] USB writing problem

[Eric Blossom]

On Mon, Aug 10, 2009 at 10:48:57AM -0700, Harvind Samra wrote:
> We've occasionally encountered cases, while running OpenBTS, where the
> USRP code hang up and starts spitting out the following message
> repeatedly:
> 
> short write xfer: 0 != 3584
> 
> In looking at fusb_linux.cc, it looks like USB writes suddenly cease to
> complete.  Sometimes, the host machine hangs so badly that a reboot is
> needed.
> 
> I know USB on linux has always had problems.  So my questions are:
> 
> 1) Is this problem specific to the USRP or does it have to do with
> libusb?
> 2) Is the specific to certain USB controllers?
> 3) Has this bug been addressed in recent updates/releases to gnuradio?
> 
> Any help is appreciated.  Thanks.
> 
> Harvind Samra
> Kestrel Signal Processing, Inc.

Hi Harvind!

I've never seen this error.
Have you checked the kernel logs? 
/var/log/messages is probably a good place to start.

Eric