I have noticed overrun on one of my HP server which has following nic

[root@CentOS7 ~]# lspci | grep -i eth
03:00.0 Ethernet controller: Emulex Corporation OneConnect 10Gb NIC (be3) (rev 01)
03:00.1 Ethernet controller: Emulex Corporation OneConnect 10Gb NIC (be3) (rev 01)

This is physical server no VMware or any kind of virtualization running on it, I have noticed on ifconfig overrun counter increasing rapidly

[root@CentOS7 ~]# ifconfig bond0 | grep -i error RX errors 0 dropped 1053 overruns 6845328 frame 0 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

ethtool stats

[root@CentOS7 ~]# ethtool -S eno1 | grep drops
     rx_drops_no_pbuf: 3423057
     rx_drops_no_erx_descr: 0
     rx_drops_no_tpre_descr: 0
     rx_drops_too_many_frags: 0
     rx_drops_mtu: 0
     eth_red_drops: 0
     roce_drops_payload_len: 0
     roce_drops_crc: 0
     rxq0: rx_drops_no_skbs: 0
     rxq0: rx_drops_no_frags: 13
     rxq1: rx_drops_no_skbs: 0
     rxq1: rx_drops_no_frags: 20
     rxq2: rx_drops_no_skbs: 0
     rxq2: rx_drops_no_frags: 92
     rxq3: rx_drops_no_skbs: 0
     rxq3: rx_drops_no_frags: 346
     rxq4: rx_drops_no_skbs: 0
     rxq4: rx_drops_no_frags: 582
     txq0: tx_drv_drops: 0
     txq1: tx_drv_drops: 0
     txq2: tx_drv_drops: 0
     txq3: tx_drv_drops: 0

Driver version

[root@CentOS7 ~]# ethtool -i eno1
driver: be2net
firmware-version: 4.0.493.0
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: no
supports-priv-flags: no

Trying to increase RX ring buffer but getting error

[root@CentOS7 ~]# ethtool -g eno1
Ring parameters for eno1:
Pre-set maximums:
RX:     1024
RX Mini:    0
RX Jumbo:   0
TX:     2048

Here is the error

[root@CentOS7 ~]# ethtool -G eno1 rx 2048
Cannot set device ring parameters: Operation not supported

Kernel version

3.10.0-514.el7.x86_64 #1 SMP

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