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Re: [Discuss-gnuradio] Some Basic USRP questions

From: satarkar
Subject: Re: [Discuss-gnuradio] Some Basic USRP questions
Date: Mon, 6 Apr 2009 15:14:36 -0400 (EDT)
User-agent: SquirrelMail/1.4.16

> 1) uO means usrp overrun, i.e. the usrp had more data to send, but the
> host computer was not fast enough to accept it and calculate it, so it
> was dropped. setting the decimation rate to its maximum value does
> decrease the processing load on your cpu, but on old systems or very
> "heavy" flowgraphs your cpu might still be overloaded. try closing any
> other programs running (e.g. don't watch youtube videos at the same
> time)
> 2) no, the decimation and interpolation rates don't need to be equal,
> but their combined values need to not saturate the usb 2.0 bus
> Dimitris Symeonidis
> "If you think you're too small to make a difference, try sleeping with
> a mosquito!" - Amnesty International
> On Mon, Apr 6, 2009 at 20:14,  <address@hidden> wrote:
>> Hi,
>> I have a few basic USRP questions. I have gone through the mail archive
>> and USRP wiki page but could not find answer to them.
>> 1) When I run my scripts I sometimes get "uOuOuO" message. I read in the
>> archives that I need to increase the decimation rate but I have already
>> set it to the maximum limit of 256. What should I do? Also, why do I not
>> get the message all the time?
>> 2) When configuring the USRP Tx and Rx, is it necessary that the
>> interpolation and decimation rates should be the same?
>> thanks and regards,
>> -Sumit Satarkar
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

thanks Dimitris!

there is nothing else going on the host. Should I just reduce the data
rate? Currently it is 32kbps.
and how do I find out that the USB bus is getting saturated?


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