My end goal is to use Gnuradio with an N320 to support 250 MS/s streaming. I am posting to the USRP users list first, because I think that's the current area of the problem. I suspect I have a permissions or uhd.conf issue, but the documentation on how to set this up correctly is lacking. I can stream to the N320 in the "normal" way (without DPDK) via gnuradio at rates of 125 MS/s in each direction, so I know that all of the hardware and regular uhd and/or gnuradio setup is working. I have gone through and tried to set up DPDK to work with the N320 and the Ettus connectivity kit (2X SFP+) following this: https://files.ettus.com/manual/page_dpdk.html I can successfully bind the spf+ ports to the vfio-pci using the dpdk-devbind.py script. If I check with dpdk-devbind.py -status after this they show up as assigned to the DPDK driver. I updated /etc/uhd/uhd.conf as suggested, including the mac addresses, cpu assignment, etc..., but I don't think UHD is finding it correctly. When I try to call uhd (via /usr/local/lib/uhd/examples/benchmark_rate) with a use_dpdk=1 argument, I get a number of errors, including: [INFO] [MPM.PeriphManager.UDP] No CHDR interfaces found! [INFO] [MPM.PeriphManager.UDP] No CHDR interfaces found! [ERROR] [MPMD] No viable transport path found! [ERROR] [MPMD] Failure during block enumeration: RuntimeError: No viable transport path found! ... ... Error: RuntimeError: Failed to run enumerate_rfnoc_blocks() I've tried running benchmark_rate as a regular user and via sudo, as well as via gnuradio as a regular user. My gnuradio and UHD were installed from source. Same issues with all approaches. I see a very similar thread here in the 3.14.0.0 release notes and it doesn't look like these issues were resolved within that thread: http://ettus.80997.x6.nabble.com/USRP-users-UHD-Announcing-3-14-0-0-Release-Candidate-1-td11840.html Can someone from Ettus chime in? Do I need to be running UHD and/or gnuradio as root, as implied in that thread? If this requires installing things in a manner different from your published "Getting started with the N320 guide..." can you please help me understand the steps needed to get DPDK working with an N320? I am running Ubuntu 18.03.4, UHD is 3.14.0 (specifically UHD_3.14.0.HEAD-0-gf6cacec8). Thank you, DL

Hi Daniel, The uhd.conf file should be put at /root/.uhd/uhd.conf You will also need to run the UHD app as root when using DPDK. I can follow up with you offlist with some additional notes I have on getting started with DPDK. We will be publishing a detailed app note soon to cover the topic. Regards, Nate Temple On Tue, Oct 15, 2019 at 11:37 AM Lundberg, Daniel via USRP-users < usrp-users@lists.ettus.com> wrote: > My end goal is to use Gnuradio with an N320 to support 250 MS/s > streaming. I am posting to the USRP users list first, because I think > that’s the current area of the problem. I suspect I have a permissions or > uhd.conf issue, but the documentation on how to set this up correctly is > lacking. > > > > I can stream to the N320 in the “normal” way (without DPDK) via gnuradio > at rates of 125 MS/s in each direction, so I know that all of the hardware > and regular uhd and/or gnuradio setup is working. > > > > I have gone through and tried to set up DPDK to work with the N320 and the > Ettus connectivity kit (2X SFP+) following this: > https://files.ettus.com/manual/page_dpdk.html > > I can successfully bind the spf+ ports to the vfio-pci using the > dpdk-devbind.py script. If I check with dpdk-devbind.py –status after this > they show up as assigned to the DPDK driver. > > > > I updated /etc/uhd/uhd.conf as suggested, including the mac addresses, cpu > assignment, etc…, but I don’t think UHD is finding it correctly. When I > try to call uhd (via /usr/local/lib/uhd/examples/benchmark_rate) with a > use_dpdk=1 argument, I get a number of errors, including: > > > > [INFO] [MPM.PeriphManager.UDP] No CHDR interfaces found! > > [INFO] [MPM.PeriphManager.UDP] No CHDR interfaces found! > > [ERROR] [MPMD] No viable transport path found! > > [ERROR] [MPMD] Failure during block enumeration: RuntimeError: No viable > transport path found! > > … > > … > > Error: RuntimeError: Failed to run enumerate_rfnoc_blocks() > > > > I’ve tried running benchmark_rate as a regular user and via sudo, as well > as via gnuradio as a regular user. My gnuradio and UHD were installed from > source. Same issues with all approaches. I see a very similar thread here > in the 3.14.0.0 release notes and it doesn’t look like these issues were > resolved within that thread: > > > http://ettus.80997.x6.nabble.com/USRP-users-UHD-Announcing-3-14-0-0-Release-Candidate-1-td11840.html > > > > Can someone from Ettus chime in? Do I need to be running UHD and/or > gnuradio as root, as implied in that thread? If this requires installing > things in a manner different from your published “Getting started with the > N320 guide…” can you please help me understand the steps needed to get DPDK > working with an N320? > > > > I am running Ubuntu 18.03.4, UHD is 3.14.0 (specifically > UHD_3.14.0.HEAD-0-gf6cacec8). > > > > Thank you, > > > > DL > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >