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Re: packet_loopback_hier OTA problem

From: Marcus Müller
Subject: Re: packet_loopback_hier OTA problem
Date: Wed, 7 Jul 2021 19:46:29 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

Hi Jack,

the background shows that there's regular underflows. This might be a bug, or 
computer being overtasked. Could you run e.g. `htop` or `top` to check how 
loaded your
CPUs are?

Best regards,


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On 07.07.21 19:22, jack houston wrote:
> When running the packet loopback example, from version 3.10, it works as 
> expected
> without SDR involvement. However when using an SDR sink and source I have no 
> luck with
> it working. I have tried using different configurations of sdrs, frequencies 
> and gain
> values all known to be working on other topologies. As an example, I can use 
> my Ettus
> B205 on a OFDM packet topology using BPSK and can correctly send and receive 
> packets bar
> some padding issues. Using the same UHD with similiar bit rate and gain 
> values on the
> packet_loopback_hier example yields nothing.
> The only error I that I've received is a ursp sink underflow error which 
> should be
> irrelevant. Included is a link of a screenshot of the example file running. I 
> was told
> by a colleague that the example has been broken for a while, but if it works 
> under
> simulation I don't believe thats the case. From what I can tell something is 
> not
> correctly working on the RX side of the topology, either at the PCS or the 
> HPD. If
> someone has any knowledge about the example file and what could be causing it 
> to not
> work in my case, I would be delighted to hear about it.
> File running: https://imgur.com/a/orVuSZ5 <https://imgur.com/a/orVuSZ5>

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