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Re: [Discuss-gnuradio] usrp_siggen.py underruns

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] usrp_siggen.py underruns
Date: Wed, 11 Feb 2009 11:56:53 -0800
User-agent: Mutt/1.5.18 (2008-05-17)

On Wed, Feb 11, 2009 at 08:35:56PM +0100, Dominik Auras wrote:
> Hi!
>> That won't help.  The problem is that the gaussian RNG is really slow.
>> You'll need to figure out how to make it faster.
> I am sorry. This was an example and I hoped that the RNG is fast enough.  
> Actually, I have observed this behavior with my transmitter. As I  
> described, it doesn't send with 8 MHz bandwidth on USRP1. Before we  
> received the new USRP2s, I have thought that this is a problem of my  
> application. Even though with a nullsink, I have measured a throughput  
> in front of the nullsink of more than 30 MSamples per second.
> Now with the USRP2, my transmitter is streaming continuously, sending at  
> 12.5 Mhz bandwidth. It keeps up with this rate. There was no change in  
> the transmitter, except for using the USRP2.
> Conclusion: my code can send with at least 12.5 complex MSamples per  
> second (equal to 12.5 MHz bandwidth), but using USRP1, I can't send with  
> 8 Mhz?

What kind of an EHCI controller do you have?  
We've come across some that won't support 32MB/s on transmit.


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