Hi Nate, Sorry for the delayed reply. I found the issue and it is because of
the low power CPU.
Thanks and Regards
On Monday, November 25, 2019, 8:23:47 PM GMT, Nate Temple
<nate.tem...@ettus.com> wrote:
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.
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