Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

@robin, I reset the usrp clock to zero right before creating my threads, I also tried your suggestion of starting transmit much later, but once transmits start, I get underflows, so same problem. It doesn't look like transmitting later helps. @marcus, i've tried running on UHD 3.10.2, but I

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

On 08/14/2017 08:27 PM, Jason W Zheng via USRP-users wrote: I don't think the problem is in the metadata, unless I'm really doing it wrong. I've tried the suggestion you put out earlier, modeling my code after the example txrx_loopback_to_file. The first packet has a startofburst = true and

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

I don't think the problem is in the metadata, unless I'm really doing it wrong. I've tried the suggestion you put out earlier, modeling my code after the example txrx_loopback_to_file. The first packet has a startofburst = true and subsequent packets have the start_of_burst value and the

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

I think some of the issue here as well is the tx_metadata. For continuous streaming, the first packet ONLY should have startofburst = true… Further packets after the first one should have startofburst = false, cuz they really are not start of burst, they are continuations of the initial

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

Hi Jason, I have the same under-run problem with my project. I use x310 as well. I don't have a solution. I'll appreciate it if anyone can figure out what is causing this. Regards, Edwin Jason W Zheng via USRP-users 于2017年8月14日周一 下午2:42写道： > Hi Robin, Marcus > >

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

Willing to bet significant money your tx thread is being put on the physical processor that does not have your NIC card attached to it... Then, all data must go over QPI between processors. NUMA is not good for this. You can experiment with affinity to make sure things are all on the same

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

On 08/14/2017 02:48 PM, Jason W Zheng wrote: Hi Marcus, Robin, I've set the tx_metadata, yet the issue still occurs. There are constant streams of underruns when receiving and transmitting on the same channel. I've attached the code One thing I notice, and forgive me if I'm just missing

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

I'm running on a server with 2 Intel Xeon E5-2650 v4, CPU is listed here: https://ark.intel.com/products/91767/Intel-Xeon-Processor-E5-2650-v4-30M-Cache-2_20-GHz The network card I'm using is the recommended Intel X520-DA2 I also have over 500 gigs of ram, so that is not an issue I don't think

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

How should I set the tx metadata? My application will essentially stream continuously. Thanks, Jason From: ROBIN TORTORA Sent: Monday, August 14, 2017 11:17:07 AM To: Jason W Zheng via USRP-users; Jason W Zheng Subject: Re: [USRP-users]

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

I dont see you setting the tx metadata object members to any values, so you are essentially going to tx with default metadata IF there is a constructor that initializes all the members to a consistent value... > On August 14, 2017 at 1:56 PM Jason W Zheng via USRP-users >

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

What are the specs on your computer? What type of 10GiG interface card are you using? On 2017-08-14 13:56, Jason W Zheng via USRP-users wrote: > Since I haven't gotten a response in a week, I thought some source code might > help. I've removed any buffer dependencies leaving just the receive

Re: [USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

Since I haven't gotten a response in a week, I thought some source code might help. I've removed any buffer dependencies leaving just the receive thread and transmit thread. The receive thread is constant receiving to a buffer, while the transmit thread is constantly transmitting 0s from

[USRP-users] Buffer underrun issue with simultaneous transmit and receive on the X310

Hi, I'm building an application where I receive data from the x310, process the data, then transmit it out. I have 3 separate threads running, one for each task. The receive task is constantly receiving data from the x310 at 200MS/s and putting it into a buffer. The process task takes data