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

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] number of blocks in a burst over USB
Date: Wed, 30 May 2007 11:35:15 -0700
User-agent: Mutt/1.5.9i

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 
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?


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