The network of performance tuning-Ethtool simple usage

Used to take Ethtool to determine whether the physical connection of the network is normal, and other functions have not been carefully read, but Ethtool is not simply to see if the network card is linked so simple, today to share the Ethtool tool simple usage.

First look at the command help:

usage:ethtool devnamedisplay standard information about device         ethtool -s|--change DEVNAMEChange generic options[  speed 10|100|1000|2500|10000 ][ duplex half|full ][ port tp|aui|bnc|mii| fibre ][ autoneg on|off ][ advertise %%x ][ phyad %%d ][  xcvr internal|external ][ wol p|u|m|b|a|g|s|d... ][ sopass %%x:%%x:%% X:%%x:%%x:%%x ][ msglvl %%d ]         ethtool  -a|--show-pause DEVNAMEShow pause options         Ethtool -a|--pause devnameset pause options[ autoneg on|off ][ rx  on|off ][ tx on|off ]        ethtool -c |--show-coalesce devnameshow coalesce options        ethtool -c|--coalesce  devnameset coalesce options[adaptive-rx on|off][adaptive-tx on|off][rx-usecs n][ Rx-frames n][rx-usecs-irq n][rx-frames-irq n][tx-usecs n][tx-frames n][tx-usecs-irq  n][tx-frames-irq n][stats-block-usecs n][pkt-rate-low n][rx-usecs-low n][ rx-frames-low n][tx-usecs-low n][tx-frames-low n][pkt-rate-high n][rx-usecs-high n][ rx-frames-high n][tx-usecs-high n][tx-frames-high n][sample-interval n]         ethtool -g|--show-ring DEVNAMEQuery RX/TX ring  parameters        ethtool -g|--set-ring devnameset rx/ tx ring parameters[ rx n ][ rx-mini n ][ rx-jumbo n ][  tx n ]        ethtool -k|--show-offload devnameget protocol offload  information        ethtool -k|--offload devnameset  protocol offload[ rx on|off ][ tx on|off ][ sg on|off ][  tso on|off ][ ufo on|off ][ gso on|off ]         ethtool -i|--driver DEVNAMEShow driver information         ethtool -d|--register-dump DEVNAMEDo a register  dump[ raw on|off ][ file filename ]         ethtool -e|--eeprom-dump devnamedo a eeprom dump[ raw on|off ][  offset n ][ length n ]        ethtool  -e|--change-eeprom devnamechange bytes in device eeprom[ magic n ][ offset n ][  value N ]        ethtool -r|--negotiate  devnamerestart n-way negotation        ethtool -p|-- identify devnameshow visible port identification  (e.g. blinking)                 [ TIME-IN-SECONDS ]         ethtool -t|--test DEVNAMEExecute adapter  self test               [  online | offline ]        ethtool -s|-- statistics devnameshow adapter statistics         Ethtool -h|--help devnameshow&nbSp;this help 

Ethtool directly with the network card name, you can view all the network card information:

settings for eth0:supported ports: [ tp ]supported link modes:    10baseT/Half 10baseT/Full                          100baseT/Half  100baset/full                          1000baset/full supported pause frame  use: nosupports auto-negotiation: yesadvertised link modes:  10baset/ half 10baset/full                          100baseT/Half 100baseT/Full                           1000baset/full advertised pause frame use: noadvertised auto-negotiation:  yesspeed: 1000mb/sduplex: fullport: twisted pairphyad: 0transceiver:  internalauto-negotiation: onmdi-x: off  (Auto) supports wake-on: dwake-on:  dcurrent message level: 0x00000007  (7)        drv  Probe linklink detected: yes

Can see eth0 this network card is automatically negotiated, full-duplex, the rate is 1000mb/s, the last line is to show whether your network card has a connection cable.

Ethtool-a eth0: Check the interrupt settings of the ETH0 network card:

Pause parameters for Eth0:Autonegotiate:onRX:offTX:off

Ethtol-i eth0: Check the drive name and info for the NIC:

Driver:e1000version:7.3.21-k8-napifirmware-version:bus-info:0000:02:01.0supports-statistics:yessupports-test: Yessupports-eeprom-access:yessupports-register-dump:yessupports-priv-flags:no

Ethtool-s|--statistics eth0: View network card statistics (including received and transferred packets):

Nic statistics:     rx_packets: 45326     tx_ Packets: 17215     rx_bytes: 53883145     tx_bytes :  1510536     rx_broadcast: 0     tx_broadcast:  0     rx_multicast: 0     tx_multicast: 0      rx_errors: 0     tx_errors: 0      tx_dropped: 0     multicast: 0      collisions: 0     rx_length_errors: 0     rx _over_errors: 0     rx_crc_errors: 0     rx_frame_ Errors: 0     rx_no_buffer_count: 0     rx_missed_ Errors: 0     tx_aborted_errors: 0     tx_carrier_errors: 0      tx_fifo_errors: 0     tx_heartbeat_errors: 0      tx_window_errors: 0     tx_abort_late_coll: 0      tx_deferred_ok: 0     tx_single_coll_ok: 0      tx_multi_coll_ok: 0     tx_timeout_count: 0      tx_restart_queue: 0     rx_long_length_errors: 0      rx_short_length_errors: 0     rx_align_errors: 0      tx_tcp_seg_good: 24     tx_tcp_seg_failed: 0      rx_flow_control_xon: 0     rx_flow_control_xoff:  0     tx_flow_control_xon: 0     tx_flow_control_xoff: 0      rx_long_byte_count: 53883145     rx_csum_offload_good:  45078     rx_csum_offload_errors: 0     alloc_rx_buff_ Failed: 0     tx_smbus: 0     rx_smbus: 0      dropped_smbus: 0

Ethtool-s can change the speed and auto-negotiation parameters of the NIC:

# ethtool -s eth0 speed 100 autoneg off# root at vm3 in  ~ [14:50:52]# ethtool eth0 settings for eth0:supported ports: [  TP ]Supported link modes:   10baseT/Half 10baseT/Full                           100baseT/Half 100baseT/Full                           1000baset/full supported pause frame use: nosupports auto-negotiation:  Yesadvertised link modes:  not reportedadvertised pause frame use:  NoAdvertised auto-negotiation: NoSpeed: 100Mb/sDuplex: FullPort: Twisted  pairphyad: 0transceiver: internalauto-negotiation: offmdi-x: off  (Auto) supports wake-on: dwake-on:  dcurrent message level: 0x00000007  (7)        drv  Probe linklink detected: yes

However, there is no special needs or not to change the network card rate, who want the faster the better.

The most commonly used is the following usage, I have previously worked on the production environment to adjust the network card of the RS and TX values.

Ethtool-k eth0, which shows the offload value of the TCP protocol for the NIC,-K can be adjusted for a parameter:

# ethtool -k eth0 features for eth0:rx-checksumming: offtx-checksumming:  ontx-checksum-ipv4: off [fixed]tx-checksum-ip-generic: ontx-checksum-ipv6: off  [fixed]tx-checksum-fcoe-crc: off [fixed]tx-checksum-sctp: off [fixed]scatter-gather:  ontx-scatter-gather: ontx-scatter-gather-fraglist: off [fixed]tcp-segmentation-offload:  Ontx-tcp-segmentation: ontx-tcp-ecn-segmentation: off [fixed]tx-tcp6-segmentation: off  [fixed]udp-fragmentation-offload: off [fixed]generic-segmentation-offload:  ongeneric-receive-offload: onlarge-receive-offload: off [fixed]rx-vlan-offload:  ontx-vlan-offload: on [fixed]ntuple-filters: off [fixed]receive-hashing: off [ Fixed]highdma: off [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] Tx-gre-segmentation: off [fixed]tx-ipip-segmentation: off [fixed]tx-sit-segmentation:  off [fixed]tx-udp_tnl-segmentation: off [fixed]fcoe-mtu: off [fixed] Tx-nocache-copy: offloopback: off [fixed]rx-fcs: offrx-all: offtx-vlan-stag-hw-insert :  off [fixed]rx-vlan-stag-hw-parse: off [fixed]rx-vlan-stag-filter: off [fixed] L2-fwd-offload: off [fixed]busy-poll: off [fixed]

Tcp-segmentation-offload:on refers to TCP shard work for packets that are larger than the system MTU setting, which is handled by the NIC instead of the CPU.

Generic-segmentation-offload:on similar to TSO, in addition to TCP packets, other protocol packages can also be partitioned with network cards.

Rx-checksumming:off refers to the checksum that disables received.

Tx-checksumming:on is the checksum that opens transfer.

The production environment servers are all 2个万 gigabit NIC bindings are used to accept the telco sig data, so my adjustments are as follows:

For I in 1 2 3 4;do for J in Rx Tx;do ethtool-k eth$i $j off;done;done for I in 1 2 3 4;do for J in Tso Gso;do Ethtool-k Eth$i $j On;done;done

Disable RX, TX for all network cards, and turn on TSO and GSO for all NICs to improve network performance.

Welcome to add!

This article is from "Tianya Horizon" blog, please be sure to keep this source http://shanker.blog.51cto.com/1189689/1766726

The network of performance tuning-Ethtool simple usage