linux 查询网卡速率

1 $ifconfig

[root@localhost tinynet]# ifconfig
eth1      Link encap:Ethernet  HWaddr 00:0C:29:15:0C:8F
          inet addr:192.168.22.61  Bcast:192.168.22.255 Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe15:c8f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:21837690 errors:0 dropped:0 overruns:0 frame:0
          TX packets:25586224 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:5981318187 (5.5 GiB) TX bytes:3560555762 (3.3 GiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:43294922 errors:2751 dropped:2751 overruns:0 frame:0
          TX packets:43294922 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3836215850 (3.5 GiB) TX bytes:3836215850 (3.5 GiB)

2 $ethtool eth1

[root@localhost tinynet]# ethtool eth1
Settings for eth1:
        Supported ports: [ TP ]
        Supported link modes: 10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes: 10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

一般来说，1000Mb的单位是bit,而不是byte,所以网卡流量的上限应该是1000Mb/8=125M.