Hi Voonna, What is your CPU frequency?
What kind of NIC are you using? If your NIC supports DPDK, I would recommend trying to use the DPDK transport, but you will need to update to UHD 3.14.1.1 to support DPDK with the X310. https://files.ettus.com/manual/page_dpdk.html Regards, Nate Temple On Thu, Nov 21, 2019 at 9:35 AM voonna santosh via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi Michael, > I am experiencing lots of underflows when I use benchmark_rate example > app. Following is the configuration: > > Host processor : Intel® Xeon® Processor D-1500 System on Chip (SoC) > Host OS: Centos 7 > UHD: release_003_010_001_000 > SDR HW: X300 with UBX-160 (Calibration done as documented) > Eth link: SFP > - Maximum socket buffer sizes (wmem_max, rmem_max) > - MTU 9000 > - Tx/Rx descriptors (sudo ethtool -G <interface> tx 4096 rx 4096) > - thread priority set to 1 > CPU usage: Only two CPUs are being used, but rest of the cores are free > and the host is headless(No CPU consuming apps). > > If I test rx_rate with 200Msps, it works well. But when I use tx_rate > with 100Msps, I could see lots of underflows (Us). > > ./benchmark_rate --args="addr=192.168.40.2" --tx_rate=100e6 > --channels="0" --duration 200 > linux; GNU C++ version 4.8.5 20150623 (Red Hat 4.8.5-39); Boost_105800; > UHD_003.010.001.HEAD-0-g929e3b32 > > > Creating the usrp device with: addr=192.168.40.2... > -- X300 initialization sequence... > -- Determining maximum frame size... 8000 bytes. > -- Setup basic communication... > -- Loading values from EEPROM... > -- Setup RF frontend clocking... > -- Radio 1x clock:200 > -- Detecting internal GPSDO.... Found an internal GPSDO: LC_XO, Firmware > Rev 0.929b > -- [DMA FIFO] Running BIST for FIFO 0... pass (Throughput: 1179.5MB/s) > -- [DMA FIFO] Running BIST for FIFO 1... pass (Throughput: 1184.4MB/s) > -- [RFNoC Radio] Performing register loopback test... pass > -- [RFNoC Radio] Performing register loopback test... pass > -- [RFNoC Radio] Performing register loopback test... pass > -- [RFNoC Radio] Performing register loopback test... pass > -- Performing timer loopback test... pass > -- Performing timer loopback test... pass > Using Device: Single USRP: > Device: X-Series Device > Mboard 0: X300 > RX Channel: 0 > RX DSP: 0 > RX Dboard: A > RX Subdev: UBX RX > RX Channel: 1 > RX DSP: 0 > RX Dboard: B > RX Subdev: Unknown (0xffff) - 0 > TX Channel: 0 > TX DSP: 0 > TX Dboard: A > TX Subdev: UBX TX > TX Channel: 1 > TX DSP: 0 > TX Dboard: B > TX Subdev: Unknown (0xffff) - 0 > > Setting device timestamp to 0... > Testing transmit rate 100.000000 Msps on 1 channels > UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU ....... Lots of > underflows > > Thanks in advance. > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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