Re: [Discuss-gnuradio] USB writing problem

[Harvind Samra]

We've seen it on a couple of Dell laptops, as well as the Atom boards we
used at Burning Man.  I'll get the EHCI controller information ASAP.

We are using an inband-signaling RBF, inband_1rxhb_1tx.rbf.  Could that
be the source of the problem?

All these machines were running Ubuntu 8.x or 9.x.  No VM involved
whatsoever.

This was the only gnuradio/USRP hiccup with OpenBTS at Burning Man, we
had to reboot the basestation every few hours.  Overall, I think the
system performed fairly well; we fixed a lot of bugs and got about 1300
registered users who made phone calls and text messages.  We're pouring
through the logs this week.  We'll be posting more details at
http://openbts.blogspot.com.



On Sun, 2009-09-13 at 11:45 -0700, Eric Blossom wrote:
> 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