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Re: [USRP-users] Poor Data Rates with the USRP E312

From: Marcus D Leech
Subject: Re: [USRP-users] Poor Data Rates with the USRP E312
Date: Sun, 22 Nov 2020 21:39:59 -0500

The E31x series really are intended for applications where all the high sample 
rate stuff happens in the FPGA. 

The ARM cpu is only dual core and runs at under 1Ghz. 

The scenario you describe is a lot like what we used to call “network mode” for 
the E31x, and it was never recommended for that type of scenario. 

Sent from my iPhone

> On Nov 22, 2020, at 9:21 PM, Joe Crossen via USRP-users 
> <usrp-users@lists.ettus.com> wrote:
> Hi all, 
> I'm attempting to use the USRP E312 as a wifi node using the gr-ieee802.11 
> module... 
> though for now I'm testing basic USRP functionality with a couple of simple 
> GNU graphs. 
> Here's my setup:
> - the host is an Ubuntu 18.04 virtual machine with a bridged adaptor. 
> Firewall disabled. 
> - the USRP is the E312, connected via ethernet to the host network.  
> - the host and USRP are both running GR3.8 and UHD4.0 (Zeus branch). 
> - the host can see the USRP with uhd_usrp_probe.
> - the USRP is running the following GNU graph - UHD:USRP Source -> UDP Sink.
> - host is running the following GNU graph - UDP Source -> QT GUI Sink.
> - all block parameters are default.
> I'm experiencing the following issues:
> 1. For sample rates > ~2Msps, the USRP spams overrun "O" and "D" characters 
> (what does the "D" signify?) , regardless of whether the host graph is 
> running or not.
> 2. At any sample rate the host graph spams the following message (when the 
> USRP graph is running) - "gr::log :WARN: udp_source0 - Too much data; 
> dropping packet."
> And a question:
> 3. What sample rates are realistic for this setup, and what are the 
> limitations? wifi channels span 20MHz, so I'm hoping to run at 20Msps
> Thanks,
> Joe
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