Hi Martin, I tried to get rid of the underflow issue but didnt succeed. Our setup consists of a host PC equipped with an AMD Threadripper Pro 3955WX (16 cores), 160 GB of RAM, and a Mellanox MT27800. It is connected to the X440 via a single 100 GbE cable.
Im using the default X440_X4_1600 image and UHD4.8.0.0 To use DPDK I followed this instruction: https://kb.ettus.com/Getting_Started_with_DPDK_and_UHD The only thing I changed was the line dpdk_driver=/usr/lib/x86_64-linux-gnu/dpdk/pmds-20.0/ -> dpdk_driver=/usr/lib/x86_64-linux-gnu/dpdk/pmds-22.0/ in uhd.conf I also played around with dpdk_num_mbufs by setting it to e.g. 8192. However, I still get underflow issues: \[INFO\] \[UHD\] linux; GNU C++ version 13.1.0; Boost_107400; DPDK_21.11; UHD_4.8.0.0-0-g308126a4 EAL: Detected CPU lcores: 32 EAL: Detected NUMA nodes: 1 EAL: Detected shared linkage of DPDK EAL: Multi-process socket /var/run/dpdk/rte/mp_socket EAL: Selected IOVA mode 'VA' EAL: No available 1048576 kB hugepages reported EAL: Probe PCI driver: mlx5_pci (15b3:1017) device: 0000:41:00.0 (socket 0) EAL: Probe PCI driver: mlx5_pci (15b3:1017) device: 0000:41:00.1 (socket 0) TELEMETRY: No legacy callbacks, legacy socket not created \[00:00:00.000240\] Creating the usrp device with: addr=192.168.60.243,mgmt_addr=10.157.161.243,master_clock_rate=2e9,use_dpdk=1... \[INFO\] \[MPMD\] Initializing 1 device(s) in parallel with args: mgmt_addr=10.157.161.243,type=x4xx,product=x440,serial=32C7660,name=ni-x4xx-32C7660,fpga=X4_1600,claimed=False,addr=192.168.60.243,master_clock_rate=2e9,use_dpdk=1 \[WARNING\] \[MPM.RPCServer\] A timeout event occured! \[INFO\] \[MPM.PeriphManager\] init() called with device args \`fpga=X4_1600,master_clock_rate=(2000000000.0, 2000000000.0),mgmt_addr=10.157.161.243,name=ni-x4xx-32C7660,product=x440,use_dpdk=1,clock_source=internal,time_source=internal,initializing=True'. Using Device: Single USRP: Device: X400-Series Device Mboard 0: x440 RX Channel: 0 RX DSP: n/a RX Dboard: A RX Subdev: 0 TX Channel: 0 TX DSP: n/a TX Dboard: A TX Subdev: 0 \[00:00:03.670625969\] Setting device timestamp to 0... \[00:00:03.673117806\] Testing receive rate 2000.000000 Msps on 1 channels Setting TX samples per packet (spp) to 1984 Setting TX samples per burst (spb) to 1984 \[00:00:03.675296572\] Testing transmit rate 2000.000000 Msps on 1 channels OUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUterminate called after throwing an instance of 'uhd::op_timeout' what(): RfnocError: OpTimeout: Control operation timed out waiting for ACK Aborted (core dumped) What can be the issue here? Best, Peter
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