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Re: [Discuss-gnuradio] LibUSRP vs LibUHD Performance on older machines

From: Josh Blum
Subject: Re: [Discuss-gnuradio] LibUSRP vs LibUHD Performance on older machines
Date: Fri, 01 Mar 2013 16:55:44 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130106 Thunderbird/17.0.2

On 03/01/2013 04:51 PM, Tom Hendrick wrote:
> Hello all,
> I've had trouble making a 4 channel USRP samples at 1Ms/s write to file at 
> 500 kS/s with ubuntu 12.04 and libuhd.  I am getting several overruns and I 
> had tried adjusting some of the parameters using usrd_probe_devices but with 
> no success. I have a laptop with a duo core centrino processor which should 
> be enough.
> I've made this 4 channel work successfully with the same exact laptop and 
> with ubuntu 10.04 and the older version of gnuradio that uses libusrp.  I get 
> no underruns at all even for an entire hour of writing to file.  
> Has anyone else experienced performance differences between libusrp and 
> libuhd?  I just want to make sure it isn't a configuration problem or 
> something I'm doing wrong causing the overruns.  If its likely an issue with 
> libuhd, I guess I will just keep a backup of ubuntu 10.04 and gnuradio 
> libusrp version installation files and leave my dual boot setup intact.
> Thank you very much, - Tom

You might try setting a very large output buffer on the usrp source
block. I heard this helps (you should be able to call this in python
after the block constructs):

   * \brief Sets max buffer size on all output ports.
  void set_max_output_buffer(long max_output_buffer)


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