Linux: how to optimize an ethernet adapter settings

 Platform:

Red Hat Enterprise Linux Server release 6.5 (Santiago)
how to learn ethernet device driver details



ethtool -i eth1

# ethtool -i eth1
driver: igb
version: 5.2.5
firmware-version: 2.1.0
bus-info: 0000:01:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no


# lspci -v | grep -A 14 '01:00.1'
01:00.1 Ethernet controller: Intel Corporation 82575EB Gigabit Network Connection (rev 02)
Subsystem: Intel Corporation Device 34de
Flags: bus master, fast devsel, latency 0, IRQ 28
Memory at b1a00000 (32-bit, non-prefetchable) [size=128K]
I/O ports at 1000 [size=32]
Memory at b1a40000 (32-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 2
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [60] MSI-X: Enable+ Count=10 Masked-
Capabilities: [a0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number 00-1e-67-ff-ff-0c-9a-29
Kernel driver in use: igb
Kernel modules: igb

how to list ethernet adapter list

[root@server~]# lspci | grep Ethernet
01:00.0 Ethernet controller: Intel Corporation 82575EB Gigabit Network Connection (rev 02)
01:00.1 Ethernet controller: Intel Corporation 82575EB Gigabit Network Connection (rev 02)
02:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
02:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)

how to learn supported RX / TX ring buffer settings of an ethernet adapter

# ethtool -g eth1
Ring parameters for eth1:
Pre-set maximums:
RX: 4096
RX Mini: 0
RX Jumbo: 0
TX: 4096
Current hardware settings:
RX: 256
RX Mini: 0
RX Jumbo: 0
TX: 256

how to change ethernet adapter rx tx ring buffer settings

# ethtool -G eth1 rx 4096 tx 4096
# ethtool -g eth1
Ring parameters for eth1:
Pre-set maximums:
RX: 4096
RX Mini: 0
RX Jumbo: 0
TX: 4096
Current hardware settings:
RX: 4096
RX Mini: 0
RX Jumbo: 0
TX: 4096

how to change ethernet features for increase ids/ips packet processing performance

disable RX checksumming :
# ethtool -K eth1 rx off


disable TX checksumming
# ethtool -K eth1 tx off

disable TCP segmentation offload
# ethtool -K eth1 tso off

disable generic receive offload
# ethtool -K eth1 gro off

disable generic segmentation offload
# ethtool -K eth1 gso off


disable scatter-gather
# ethtool -K eth1 sg off

how to show features of ethernet adapter



# ethtool -k eth1
Features for eth1:
rx-checksumming: on
tx-checksumming: on
tx-checksum-ipv4: on
tx-checksum-ip-generic: off [fixed]
tx-checksum-ipv6: on
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
tx-tcp-segmentation: on
tx-tcp-ecn-segmentation: off [fixed]
tx-tcp6-segmentation: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: on
highdma: on [fixed]
rx-vlan-filter: on [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: on
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off [fixed]


Keywords: eth0 overrun problem, eth0 drop problem, packet processsing, ips, ids, suricata, snort, bro network security monitor, packet drop


2015-10-08 - Ali Okan Yuksel - yukselao@yandex.com