Dropped Rx Packet in N321 USRP

[HarryOme21]

I am using N321 USRP for  project. The host runs Ubuntu 18.04 and UHD 4.1.0. There are two 10G SFP cables and one 1G RJ45 cables. In host, when running ifconfig command, there is no any error or packet drop on eth0 (1G RJ45), enp1s0f0 and enp1s0f1 (10G SFP) interfaces. But when I use SSH to log into N321, I find packet dropped in USRP. 

I have configured MTU=1500 for 1G interface and MTU=9000 for SFPs in host and N321.

Below is the ifconfig result in N321:

root@ni-n3xx-320CAAB:~# ifconfig

eth0      Link encap:Ethernet  HWaddr 00:80:2F:32:36:BA

          inet addr:192.168.10.165  Bcast:192.168.255.255  Mask:255.255.0.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:618374 errors:0 dropped:11485 overruns:0 frame:0

          TX packets:193714 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:39776733 (37.9 MiB)  TX bytes:14546432 (13.8 MiB)

          Interrupt:27 Base address:0xb000

int0      Link encap:Ethernet  HWaddr AE:CD:BA:E1:CF:96

          inet addr:169.254.0.1  Bcast:169.254.0.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1

          RX packets:456 errors:0 dropped:0 overruns:0 frame:0

          TX packets:15 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:37392 (36.5 KiB)  TX bytes:2770 (2.7 KiB)

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          UP LOOPBACK RUNNING  MTU:65536  Metric:1

          RX packets:89 errors:0 dropped:0 overruns:0 frame:0

          TX packets:89 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:7480 (7.3 KiB)  TX bytes:7480 (7.3 KiB)

sfp0      Link encap:Ethernet  HWaddr 00:80:2F:32:36:BB

          inet addr:192.168.12.2  Bcast:192.168.12.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1

          RX packets:6239 errors:0 dropped:804 overruns:0 frame:0

          TX packets:5669 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:18466697 (17.6 MiB)  TX bytes:18417536 (17.5 MiB)

sfp1      Link encap:Ethernet  HWaddr 00:80:2F:32:36:BC

          inet addr:192.168.13.2  Bcast:192.168.13.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1

          RX packets:24868 errors:0 dropped:796 overruns:0 frame:0

          TX packets:24613 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:20486915 (19.5 MiB)  TX bytes:19611643 (18.7 MiB)

Below is ifconfig result in host:

user@USRP-SERVER:~$ ifconfig

eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.10.143  netmask 255.255.0.0  broadcast 192.168.255.255

        inet6 fe80::b27b:25ff:fe1d:9e4e  prefixlen 64  scopeid 0x20<link>

       ether b0:7b:25:1d:9e:4e  txqueuelen 1000  (Ethernet)

        RX packets 5604  bytes 416435 (416.4 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 404  bytes 68556 (68.5 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

        device interrupt 16  memory 0xd2100000-d2120000

enp1s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000

        inet 192.168.12.1  netmask 255.255.255.0  broadcast 192.168.12.255

        inet6 fe80::faf2:1eff:fe42:dddc  prefixlen 64  scopeid 0x20<link>

        ether f8:f2:1e:42:dd:dc  txqueuelen 1000  (Ethernet)

        RX packets 294  bytes 35184 (35.1 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 395  bytes 37148 (37.1 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp1s0f1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000

        inet 192.168.13.1  netmask 255.255.255.0  broadcast 192.168.13.255

        inet6 fe80::faf2:1eff:fe42:dddd  prefixlen 64  scopeid 0x20<link>

        ether f8:f2:1e:42:dd:dd  txqueuelen 1000  (Ethernet)

        RX packets 9  bytes 2228 (2.2 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 72  bytes 7983 (7.9 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1000  (Local Loopback)

        RX packets 21071  bytes 1497110 (1.4 MB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 21071  bytes 1497110 (1.4 MB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Could anyone shed light on the possible reason for packet drop in USRP? How to fix it?

Thanks and kind regards,

Hongwei