Thank you Rob for the advice, actually I have made symlink as in the thread 
introduced, however I still got the error "not viable"...

________________________________
From: Rob Kossler <[email protected]>
Sent: 06 April 2021 18:23:05
To: Chang, Kaixin
Cc: [email protected]
Subject: Re: [USRP-users] dpdk, VFIO group is not viable

Hi Kasim,
There are some previous posts to the user's list around Feb 2-3, 2021 regarding 
some DPDK troubles I was having. In particular, Aaron Rossetto mentioned 
putting just a few symlinks in a new folder and using the dpdk_driver variable 
from uhd.conf to point to this folder.  This may be helpful for your case.
Rob

On Tue, Apr 6, 2021 at 9:37 AM Chang, Kaixin 
<[email protected]<mailto:[email protected]>> wrote:

Dear Ettus team,


I followed the instruction of 
https://kb.ettus.com/Getting_Started_with_DPDK_and_UHD to enable dpdk for my 
X310, however I have an error when I execute benchmark_rate as sudo su


[INFO] [UHD] linux; GNU C++ version 9.3.0; Boost_107100; 
UHD_4.0.0.0-93-g3b9ced8f
EAL: Detected 4 lcore(s)
EAL: Detected 1 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: No free hugepages reported in hugepages-1048576kB
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: PCI device 0000:00:1f.6 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 8086:15d7 net_e1000_em
EAL: PCI device 0000:0e:00.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 8086:10fb net_ixgbe
EAL:   0000:0e:00.0 VFIO group is not viable!
EAL: Requested device 0000:0e:00.0 cannot be used
EAL: PCI device 0000:0e:00.1 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 8086:10fb net_ixgbe
EAL:   0000:0e:00.1 VFIO group is not viable!
EAL: Requested device 0000:0e:00.1 cannot be used
[ERROR] [DPDK] No available DPDK devices (ports) found!
[ERROR] [UHD] Device discovery error: RuntimeError: No available DPDK devices 
(ports) found!
EAL: FATAL: already called initialization.
EAL: already called initialization.
[ERROR] [DPDK] Error with EAL initialization
[ERROR] [X300] X300 Network discovery error RuntimeError: Error with EAL 
initialization
[00:00:00.000506] Creating the usrp device with: 
addr=192.168.30.2,second_addr=192.168.40.2,use_dpdk=1...
EAL: FATAL: already called initialization.
EAL: already called initialization.
[ERROR] [DPDK] Error with EAL initialization
[ERROR] [UHD] Device discovery error: RuntimeError: Error with EAL 
initialization
EAL: FATAL: already called initialization.
EAL: already called initialization.
[ERROR] [DPDK] Error with EAL initialization
[ERROR] [X300] X300 Network discovery error RuntimeError: Error with EAL 
initialization
Error: LookupError: KeyError: No devices found for ----->
Device Address:
    addr: 192.168.30.2
    second_addr: 192.168.40.2
    use_dpdk: 1

Why is 0000:0e:00.1 VFIO group is not viable!? I have checked dpdk-devbind 
--status-dev net and get

Network devices using DPDK-compatible driver
============================================
0000:0e:00.0 '82599ES 10-Gigabit SFI/SFP+ Network Connection 10fb' drv=vfio-pci 
unused=ixgbe
0000:0e:00.1 '82599ES 10-Gigabit SFI/SFP+ Network Connection 10fb' drv=vfio-pci 
unused=ixgbe

Network devices using kernel driver
===================================
0000:00:1f.6 'Ethernet Connection (4) I219-LM 15d7' if=enp0s31f6 drv=e1000e 
unused=vfio-pci
0000:02:00.0 'Wireless 8265 / 8275 24fd' if=wlp2s0 drv=iwlwifi unused=vfio-pci


which seems to be fine.


thank you for your help


sincerely


Kasim

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