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[Discuss-gnuradio] usrp over/underrun problems

From: Bob Vincent
Subject: [Discuss-gnuradio] usrp over/underrun problems
Date: Tue, 15 Feb 2005 10:54:16 -0500

We've got a couple of USRP boards running on "embedded" ebx boards.

Unfortunately, we are seeing usb overruns/underruns when we run the fsk_tx / rx example. I removed the fft from the signal chain, and we still see regular overruns on the rx side. Also cut the cordic freq. to 2e6, with the same results. I thought this might change the sampling rate. Is that so?

Also, after the test runs for a few seconds many packets are lost.

Finally, setting the data rate lower seems to make things much worse. Perhaps that is because the correlator runs longer?

We're using fedora 3 on a 1G pentium 3, approximately. I suspect the usb isn't fast enough, but that's the hardware we're stuck with. So turning down the a/d clock would be good.

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