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Re: [Discuss-gnuradio] USRP underrun problems

From: Christian Pérez
Subject: Re: [Discuss-gnuradio] USRP underrun problems
Date: Sat, 5 Jun 2010 11:24:15 +0100

Hello Matt thank you for your answer, I'm sure that realtime scheduling is enabled because my program don't print the following warning:

r = gr.enable_realtime_scheduling()
   if r != gr.RT_OK:
       print "Warning: failed to enable realtime scheduling"

So, My computer is not fast enough to run my program en real time? How can I fix it? I Have a Pentium IV 3.0 Ghz HT

Thanks a lot.

On Fri, Jun 4, 2010 at 5:18 PM, Matt Ettus <address@hidden> wrote:
On 06/04/2010 03:47 AM, Chris_Spain wrote:

Hello, I trying to implement DVB-H Standar on GNU Radio and USRP.

In software, all run ok, but now I'm doing the first test with USRP and I
have a problem that I have no idea how fix it. When I try to send with a
Flex  900, freq=850M, fft-Lenth=2048, occupied-tones=1512 the program print
UuUuUuUu, USRP underrun ¿How I fix it?


You should make sure you have realtime scheduling enabled.  If you do, and still get underruns a lot of underruns, then your computer is not fast enough to run your program in real time.


Christian Pérez Fajardo

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