正在测试我的 Ubuntu Server 14.04 和 Windows 8.1 笔记本电脑之间的速度。Ubuntu 服务器最近安装了新的 10/100/1000 千兆网卡，一切运行正常，ifconfig 中显示 10/100/100。
因此我通过 10/100 路由器进行了 iperf 测试，速度为 86Mbits/s——足够好了。
然后我使用电缆将笔记本电脑直接连接到服务器，两个以太网卡均配置为千兆位......结果相同...... 86Mbits/s。
我们是否正在查看这里所需的某种形式的软件配置，或者我是否正在做一些明显错误的事情？
Iperf Dump-通过 10/100 路由器
------------------------------------------------------------
Client connecting to 192.168.0.48, TCP port 5001
TCP window size: 63.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.11 port 52708 connected with 192.168.0.48 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 103 MBytes 86.6 Mbits/sec
Iperf Dump - 交叉，均运行 10/100/1000 千兆卡
------------------------------------------------------------
Client connecting to 192.168.0.48, TCP port 5001
TCP window size: 63.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.11 port 52744 connected with 192.168.0.48 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 104 MBytes 87.0 Mbits/sec
Ubuntu Server 14.04-ethtool，lshw 输出
server@mediaserver:~$ ethtool eth1
Settings for eth1:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Transmit-only
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yes
$ lshw -C network
*-network:0
description: Ethernet interface
product: RTL8169 PCI Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:06:00.0
logical name: eth1
version: 10
serial: 14:cc:20:04:1a:5e
size: 100Mbit/s
capacity: 1Gbit/s
width: 32 bits
clock: 66MHz
capabilities: pm bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full ip=192.168.0.48 latency=64 link=yes maxlatency=64 mingnt=32 multicast=yes port=MII speed=100Mbit/s
resources: irq:21 ioport:b800(size=256) memory:ff921000-ff9210ff memory:ff900000-ff91ffff
Windows 8.1-wmic 转储
C:\Users\Nick>wmic NIC where NetEnabled=true get Name, Speed
Name Speed
Realtek PCIe GBE Family Controller 100000000
大小和容量有什么区别？服务器的大小和容量应该是1Gbits吗？
答案1
Link partner advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full
这意味着连接的另一端没有宣传千兆位能力。在这种情况下，可能就是您的 Windows 8 笔记本电脑，Windows 命令输出确实只显示 100 Mbit/s 的速度。修理您的笔记本电脑。
大小和容量有什么区别？服务器的大小和容量应该是1Gbits吗？
大小是实际连接速度，容量是服务器在该接口上可以支持的容量。如果连接的两端都支持 1G，则两端都是 1G。