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From: | Sharif Shaher |
Subject: | Re: [Discuss-gnuradio] USRP2 Maximum througput |
Date: | Wed, 10 Feb 2010 13:55:27 -0500 |
Hi Matt, Sorry to bother again, but can I use a decimation value of 2 to get 50MSamples/sec to my PC in usrp2_fft.py? I believe you suggested 4 to 512, thus the question. Any information would be greatly appreciated. Thanks, Sharif----- Original Message ----- From: "Matt Ettus" <address@hidden>
To: "Sharif Shaher" <address@hidden> Cc: <address@hidden> Sent: Wednesday, February 10, 2010 1:11 PM Subject: Re: [Discuss-gnuradio] USRP2 Maximum througput
On 02/10/2010 09:37 AM, Sharif Shaher wrote:Hello, I am trying to test my maximum achievable throughput from our USRP2 to my host PC. The easiest way for me to do this is to invoke, let say, usrp2_wfm_rcv.py. The ADC sample rate in usp2_wfm_rcv.py is set to 100Ms/sec, and the decimation rate is set to 312 for a net sample rate of 320 KS/sec. This configuration works fine, I have no overruns. However when I change the decimation rate to 10, let's say, usrp2_wfm_rcv.py returns a number of errors. Additionally, when I run usrp2_rx_cfile.py (to dump data to a file) and set the decimation to 10 or below, although I dont get any errors, it does not work. Setting the decimation to 312 works just fine. Does anyone have any idea if there is some limitation as to how little I can decimate and if so is there a way to get around this. The USRP2 advertises 50MSamp/sec max throughput, is there some other way I can validate this. Does anyone know what the maximum throughput might be (is it 50Msamp/sec), assuming my PC is not a bottleneck? Thanks, SharifThe problem you are having is that the data from the USRP2 is being fed into your soundcard after processing. So if you change the decimation to 10, it means you are trying to feed many megasamples per second into a soundcard and it won't do that.If you want to see how fast you can use your usrp, use usrp2_fft.py, which shows the spectrum. It has a place to put in the decimation ratio, so you can try 4 to 512.Matt
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