Re: [Discuss-gnuradio] USRP underrun problems

[Eric Blossom]

On Sat, Jun 05, 2010 at 11:24:15AM +0100, Christian Pérez wrote:
> 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

Not to be glib, but signal processing is one of the more CPU intensive
operations that you can attempt.  Consider buying a much more recent
computer.  Perhaps something like a dual or quad core i7?

Eric


> 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?
> >>
> >> Cheers
> >>
> >
> > 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.
> >
> > Matt