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Re: [Discuss-gnuradio] USRP Streaming Latency


From: Josh Blum
Subject: Re: [Discuss-gnuradio] USRP Streaming Latency
Date: Mon, 28 Mar 2011 13:54:44 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.14) Gecko/20110223 Lightning/1.0b2 Thunderbird/3.1.8

> I also see uU from the GRC script output about every 5 or so seconds.
> Does anyone have any idea if this is a FIFO problem, or is it a
> USRP/GRC issue?  I am using a Duo core SU7300 laptop so I would think
> it should run OK real-time unless the C++ and GRC script demand much
> more processing power when used at the same time.  Does anyone know
> any tricks I can try?
> 

The U printed means underflow, the host does not feed the USRP fast
enough. Sometimes enabling RT scheduling on the flow graph can help with
this.

-Josh



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