Re: [Discuss-gnuradio] USB writing problem

[Eric Blossom]

On Sun, Sep 13, 2009 at 09:26:10AM -0700, Harvind Samra wrote:
> Hi Eric,
> 
> These messages showed up repeatedly during our tests at Burning Man.
> Unfortunately, when they occurred, nothing relevant actually appeared
> in /var/log/messages.
> 
> Any other ideas?

No, not really.  Again, I haven't _ever_ seen this message on any 
h/w I've ever used.

Do you see it on more than one machine?
What kind of EHCI controllers do they have? (lspci -v)
Are you running on linux or something else?
Is there any kind of VM involved?

Outside of this, how did everything work out at Burning Man?

Eric


> --- Harvind
> 
> On Mon, 2009-08-10 at 11:04 -0700, Eric Blossom wrote:
> > 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