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 thread
> and transmit thread. The receive thread is constant receiving to a buffer,
> while the transmit thread is constantly transmitting 0s from another buffer.
>
> On the x310, when I receive and transmit from the same channel (same
> daughterboard), I get underflows (U's on the console), no matter what the
> rate. When I put receive and transmit on separate channels, the U's go away.
>
> How do I fix my source code so I can receive and transmit from the same
> channel without underflows?
>
> Thanks,
> Jason
>
> -------------------------
>
> FROM: USRP-users <usrp-users-boun...@lists.ettus.com> on behalf of Jason W
> Zheng via USRP-users <usrp-users@lists.ettus.com>
> SENT: Monday, August 7, 2017 1:05:05 PM
> TO: usrp-users@lists.ettus.com
> SUBJECT: [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 from the receive
> buffer, processes it, and puts it into a transmit buffer. The transmit task
> is constantly transmitting data from the transmit buffer at 12.5 MS/s.
>
> I get constant underruns (U's on the console) when I try to receive and
> transmit from the same channel on the x310. However, when I transmit and
> receive on separate channels, underruns no longer occur. I would like to
> figure out a solution to this problem as I want to processes two 200MS/s
> streams on 1 x310.
>
> This problem occurs no matter the sample rates. I've tried lowering the
> receive rate to 50MS/s (while transmitting 4x the data to balance things out)
> and there are still constant underruns though at a lower rate. I know
> processing time is not the issue as I've profiled the time it takes to
> process, and I have even removed the processing task from the application
> altogether (receive data to a buffer and do nothing with the data; constantly
> transmit 0's from the transmit buffer) and the underruns still occur.
>
> I'm running on UHD 3.11.0, and the x310 is is configured with basic TX/RX
> daughterboards and flashed with the XG image for use over two 10 gig ethernet
> links.
>
> Thanks,
>
> Jason
>
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