I am running into underflow issues when running the benchmark_rate test on a x410. The command I am running is the following:
./benchmark_rate --args="addr=192.168.20.2,type=x4xx,send_frame_size=8000,recv_frame_size=8000" --tx_rate=50e6 --tx_channels=0 --tx_delay=1 --duration=60 --priority=high --ref=internal I have a 100Gbit interface connected to the x410 using the below ethernet card. ca:00.0 Ethernet controller: Mellanox Technologies MT2910 Family [ConnectX-7] I'm running on Ubuntu 22.04.5 LTS with kernel 6.8.0-40-generic. I've confirmed that the priority=high setting is working. "top" shows the priorities of all the threads have been elevated. I've also updated a number of network settings. sysctl -w net.core.wmem_max=250000000 sysctl -w net.core.rmem_max=250000000 sysctl -w net.core.wmem_default=250000000 sysctl -w net.core.rmem_default=250000000 ethtool -G ens8f0np0 tx 8192 rx 8192 The application outputs the following: [INFO] [UHD] linux; GNU C++ version 8.4.0; Boost_108300; UHD_4.6.0.HEAD-0-g50fa3baa [00:00:00.000277] Creating the usrp device with: addr=192.168.20.2,type=x4xx,send_frame_size=8000,recv_frame_size=8000... [INFO] [MPMD] Initializing 1 device(s) in parallel with args: mgmt_addr=192.168.20.2,type=x4xx,product=x410,serial=3289B1C,name=ni-x4xx-3289 B1C,fpga=UC_200,claimed=False,addr=192.168.20.2,send_frame_size=8000,recv_frame_size=8000 [INFO] [MPM.PeriphManager] init() called with device args `fpga=UC_200,mgmt_addr=192.168.20.2,name=ni-x4xx-3289B1C,product=x410,recv_frame_s ize=8000,send_frame_size=8000,clock_source=internal,time_source=internal,initializing=True'. Using Device: Single USRP: Device: X400-Series Device Mboard 0: x410 RX Channel: 0 RX DSP: 0 RX Dboard: A RX Subdev: 0 RX Channel: 1 RX DSP: 1 RX Dboard: A RX Subdev: 1 RX Channel: 2 RX DSP: 2 RX Dboard: B RX Subdev: 0 RX Channel: 3 RX DSP: 3 RX Dboard: B RX Subdev: 1 TX Channel: 0 TX DSP: 0 TX Dboard: A TX Subdev: 0 TX Channel: 1 TX DSP: 1 TX Dboard: A TX Subdev: 1 TX Channel: 2 TX DSP: 2 TX Dboard: B TX Subdev: 0 TX Channel: 3 TX DSP: 3 TX Dboard: B TX Subdev: 1 [00:00:02.516914784] Setting device timestamp to 0... [WARNING] [0/DUC#0] The requested interpolation is odd; the user should expect passband CIC rolloff. Select an even interpolation to ensure that a halfband filter is enabled. [WARNING] [MULTI_USRP] Could not set TX rate to 50.000 MHz. Actual rate is 49.152 MHz [WARNING] [0/DUC#0] The requested interpolation is odd; the user should expect passband CIC rolloff. Select an even interpolation to ensure that a halfband filter is enabled. [WARNING] [MULTI_USRP] Could not set TX rate to 50.000 MHz. Actual rate is 49.152 MHz [WARNING] [0/DUC#1] The requested interpolation is odd; the user should expect passband CIC rolloff. Select an even interpolation to ensure that a halfband filter is enabled. [WARNING] [MULTI_USRP] Could not set TX rate to 50.000 MHz. Actual rate is 49.152 MHz [WARNING] [0/DUC#1] The requested interpolation is odd; the user should expect passband CIC rolloff. Select an even interpolation to ensure that a halfband filter is enabled. [WARNING] [MULTI_USRP] Could not set TX rate to 50.000 MHz. Actual rate is 49.152 MHz [WARNING] [0/Radio#0] Attempting to set tick rate to 0. Skipping. Setting TX spp to 1992 [00:00:02.522008533] Testing transmit rate 49.152000 Msps on 1 channels UUUUUUUUUUUUUUUUUUUUUUU[00:01:03.524365256] Benchmark complete. Benchmark rate summary: Num received samples: 0 Num dropped samples: 0 Num overruns detected: 0 Num transmitted samples: 2948209800 Num sequence errors (Tx): 0 Num sequence errors (Rx): 0 Num underruns detected: 23 Num late commands: 0 Num timeouts (Tx): 0 Num timeouts (Rx): 0 Done! Does anyone have any other suggestions for what could be tried to avoid the underruns? With a 100Gbit/s NIC, I should have plenty of network throughput.
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