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机房交换机升级换成全千兆了，想在服务器上查看下速率，
当时使用mii-tool命令查看，
mii-tool -v eth0
eth0: negotiated 100baseTx-FD, link ok
product info: vendor 00:d8:97, model 54 rev 0
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
显示的居然是百兆的，不应该啊，在交换机上查看了下对应的端口显示的是千兆，用该命令换了几台服务器显示的都是百兆，怀疑是命令的问题，后从网上找到文章换成ethtool终于正常了，在此记录下
ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: d
Current message level: 0x000000ff (255)
Link detected: yes
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