[Intel-wired-lan] Lots of rx_long_byte_count errors

[Stephen Hemminger]

I am using builtin NIC on my little Brix box and surprised to see lots
of byte count errors. Network seems a little sluggish at times.
Do use locally NFS mounted NAS for storing things like kernel trees.

$ lspci | grep Ethernet
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (13) I219-V (rev 20)
ae:00.0 Ethernet controller: Intel Corporation Ethernet Controller I225-V (rev 01)

$ sudo ethtool -i enp174s0 
driver: igc
version: 6.5.0-4-amd64
firmware-version: 1045:740
expansion-rom-version: 
bus-info: 0000:ae:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

$ sudo ethtool -S enp174s0 | grep -v ': 0$'
NIC statistics:
     rx_packets: 729954
     tx_packets: 222554
     rx_bytes: 867670928
     tx_bytes: 69174803
     rx_broadcast: 5002
     tx_broadcast: 37
     rx_multicast: 11959
     tx_multicast: 934
     multicast: 11959
     tx_tcp_seg_good: 1687
     tx_flow_control_xon: 32
     tx_flow_control_xoff: 31
     rx_long_byte_count: 867670928
     tx_queue_0_packets: 22543
     tx_queue_0_bytes: 2712687
     tx_queue_1_packets: 4547
     tx_queue_1_bytes: 1486617
     tx_queue_2_packets: 103559
     tx_queue_2_bytes: 36988065
     tx_queue_3_packets: 14732
     tx_queue_3_bytes: 13193520
     rx_queue_0_packets: 112677
     rx_queue_0_bytes: 152437202
     rx_queue_1_packets: 91981
     rx_queue_1_bytes: 130521460
     rx_queue_2_packets: 231685
     rx_queue_2_bytes: 250398158
     rx_queue_3_packets: 11095
     rx_queue_3_bytes: 10376491