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Re: [Discuss-gnuradio] Strange behavior in digital benchmark examples


From: Josh Blum
Subject: Re: [Discuss-gnuradio] Strange behavior in digital benchmark examples
Date: Thu, 03 Nov 2011 13:54:34 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1


On 11/03/2011 01:28 PM, Tuan (Johnny) Ta wrote:
> Hello all,
> 
> I just came across a strange behavior in the digital benchmark examples
> that I haven't seen before. The transmitter wouldn't stop itself after it
> finishes sending the requested data size (specified by -M argument).
> Keyboard interrupt (ctrl+C) has no effect. I had to stop it with ctrl+Z and
> kill the job after.
> 
> This behavior starts when bitrate exceeds 1M.
> 
> If I ran benchmark_rx2.py then a short period after receiving all packets
> (~30 sec), the receiver would continuously spill out "O" (overrun). This
> didn't happen if I ran benchmark_rx.py. (I ran the corresponding tx code.)
> 
> I'm not sure what could be causing it. I was able to run digital benchmark
> code on my older machine at 1.5Mbps prior to UHD (I used Ethernet driver)
> so I'm sure CPU speed isn't a problem.
> 
> To make it work with UHD driver, I made some changes to the usrp_options.py
> and generic_usrp.py.
> 

I believe that tom ported all of the gnuradio "classic" example
applications in 3.5 release. You may want to try those examples, because
I know that he has tested them recently.

I hope that helps,
-Josh



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