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Re: [Discuss-gnuradio] USRP buffer sizes

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] USRP buffer sizes
Date: Tue, 22 Feb 2005 09:12:43 -0800
User-agent: Mutt/1.5.6i

On Tue, Feb 22, 2005 at 07:41:17AM -0800, Erik Olson wrote:
> Matt Ettus wrote:
> >aU == audio underrun (not enough samples ready to send to sound card sink)
> >uU == USRP underrun (not enough sample ready to send to USRP sink)
> >uO == USRP overrun (USRP samples dropped because they weren't read in time.
> >

> How big are the USRP buffers?

Short answer: way too big.

Long answer: the USRP has buffers at three points in the path:

On the host: currently 8MB Tx, 8MB Rx.  This will be radically
reduced in combination with moving to some variation of higher
priority scheduling for our signal processing code.

On the Cypress FX2 USB peripheral: 2KB Tx and 2KB Rx.

On the FPGA: 4KB Tx and 4KB Rx.


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