Guillermo: I’ve already got queries in to the R&D team.
Sent from my iPhone > On Nov 15, 2021, at 12:17 PM, Guillermo Ortas Delgado <g.or...@gmv.com> wrote: > > > Yep, the config file is at /etc/uhd/uhd.conf and I can see that any > modifications I make on it take immediate effect. > Could you get anyone from the team who uses DPDK to look at this, please? I’d > really appreciate it. > > Best, > Guillermo > > <image001.png> > Guillermo Ortas Delgado > GNSS Engineer / > Ingeniero GNSS > GMV > Isaac Newton, 11 > P.T.M. Tres Cantos > 28760 Madrid, Spain > Tel.: +34 91 807 21 00 > Fax: +34 91 807 21 99 > www.gmv.com > <image002.png> > <image003.png> > <image003.png> > <image003.png> > <image003.png> > <image004.png> > > > De: Marcus D. Leech [mailto:patchvonbr...@gmail.com] > Enviado el: 15 November 2021 17:08 > Para: Guillermo Ortas Delgado <g.or...@gmv.com>; usrp-users@lists.ettus.com > Asunto: Re: DPDK drops samples at low rates > > On 2021-11-15 08:25, Guillermo Ortas Delgado wrote: > I will add that for an unknown reason the maximum frame size as reported by > UHD when launching the benchmark_rate app is 1556, which triggers a warning > message saying that it should be 8000 for best results. > I cannot find anywhere to set this value to 8000, even when setting > “recv_frame_size=9000,send_frame_size=9000” in the device arguments I get the > same. > > As a side note, this maximum frame size value of 1556 is good up to 100Msps > dual channel if not using DPDK. > > Best, > Guillermo > Where are you placing your uhd.conf file? See the notes on UHD configuration > locations here: > > https://files.ettus.com/manual/page_configfiles.html#configfiles_usrps > > Other than that, I'm hampered by not actually being a DPDK user, so I'm > running a bit "blind". > > > > > De: Guillermo Ortas Delgado > Enviado el: 15 November 2021 14:17 > Para: usrp-users@lists.ettus.com > CC: Marcus D Leech <patchvonbr...@gmail.com> > Asunto: DPDK drops samples at low rates > > Hi all, > > I finally managed to get DPDK working, but using DPDK results in dropped > samples even at low sampling frequencies, as low as 1Msps. For reference, I > can receive samples at 200Msps on both channels simultaneously when not using > DPDK. > I would like to know if I’m missing something or there’s something else > which needs to be tuned. > > The setup is Ubuntu 20.04 LTS, UHD 4.1.0.4, DPDK 18.11, USRP X310, and 2048 > pages of 2 MB each. The contents of my uhd.conf file are pasted below. > The command I use to run the benchmark rate example is this: > sudo /usr/local/lib/uhd/examples/./benchmark_rate > --args="use_dpdk=1,addr=192.168.110.2,second_addr=192.168.115.2" --pps > internal --rx_cpu sc16 --rx_otw sc16 --rx_rate 200e6 --channels 0,1 > --priority high --duration 30 > > Am I missing something? Can you spot any misconfiguration? > > uhd.conf file: > ;When present in device args, use_dpdk indicates you want DPDK to take over > the UDP transports > ;The value here represents a config, so you could have another section > labeled use_dpdk=myconf > ;instead and swap between them > [use_dpdk=1] > ;dpdk_mtu is the NIC's MTU setting > ;This is separate from MPM's maximum packet size > dpdk_mtu=9600 > ;NOTE: The dpdk-pmds directory includes all librte_pmd_* and librte_mempool_* > libraries > dpdk_driver=/usr/local/lib/dpdk-pmds > dpdk_corelist=11,12,13,14,15 > dpdk_num_mbufs=4096 > dpdk_mbuf_cache_size=512 > [dpdk_mac=f4:03:43:ec:29:d0] > ;ens1f0np0 > dpdk_lcore = 12 > dpdk_ipv4 = 192.168.110.1/24 > dpdk_num_desc=4096 > [dpdk_mac=f4:03:43:ec:3e:a0] > ;ens2f0np0 > dpdk_lcore = 12 > dpdk_ipv4 = 192.168.115.1/24 > dpdk_num_desc=4096 > > Thank you beforehand, > Guillermo > > > P Please consider the environment before printing this e-mail. > > > P Please consider the environment before printing this e-mail.
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