Re: [Discuss-gnuradio] number of blocks in a burst over USB

[Eric Blossom]

On Wed, May 30, 2007 at 01:47:44PM -0400, George Nychis wrote:
> 
> 
> Eric Blossom wrote:
> > 
> > What do you mean by "lock up"?
> Mouse, keyboard, whole computer becomes unresponsive *completely*
> 
> > Is it burning CPU cycles?
> It does for about a second or two, and then becomes unresponsive to 
> everything on 2 of the
> machines, only stuttered mouse movement on a third machine.
> 
> > Have you tried running it under gdb?
> 
> Under gdb it gets to writing the vendor extension command to the USRP, found 
> in
> write_cmd() of usrp_prims.cc ... and right when it executes usb_control_msg() 
> in this
> method is when the machine goes downhill and never returns.
> 
> 
> > Don't enable real-time until you get this sorted out.
> 
> Definitely.
> 
> test_usrp_basic_rx in the usrp/host/apps/ directory works fine for me.  I do 
> not see
> anything different from the construction of the RX side other than the xfer 
> USB block size
> and number of blocks to allocate.

What values are you using for fusb_block_size and fusb_nblocks in the 
constructor?
Have you checked the kernel logs?  Is it oopsing?
How much ram is in your machine?
What kernel are you running?
You're running Gentoo, right?  What version?

Eric