我的家庭网络在两个盒子之间遇到了网速慢的问题。以下是规格：
方框1： 华擎 H97 性能、曼扎罗
框2： 华擎 FM2A78M-ITX+、Debian 9
转变： Netgear GS305v2
两个盒子都通过 Cat.7（10 米和 2 米）电缆连接到交换机。所以一切都应该可以使用千兆以太网，对吗？
但运行 iperf 却得到这样的结果：
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 105 MBytes 88.5 Mbits/sec 32 sender
[ 5] 0.00-10.00 sec 103 MBytes 86.6 Mbits/sec receiver
我应该从哪里开始寻找问题？
编辑：我在一边运行iperf3 -s另一边iperf3 -c xxx.xxx.xxx.xxx。我还通过 NFS 和 ssh 上的 rsync 测试了文件传输，结果速度相同。
ethtoolDebian 机器上的输出：
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Current message level: 0x000060e4 (24804)
link ifup rx_err tx_err hw wol
Link detected: yes
在 Manjaro 机器上：
Settings for enp0s25:
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
Supported FEC modes: Not reported
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
Advertised FEC modes: Not reported
Speed: 100Mb/s
Duplex: Half
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: off
MDI-X: off (auto)
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
看起来 Manjaro 接口仅设置了 100Mb/s。
答案1
启用网络接口的自动协商并ethtool -s enp0s25 autoneg on修复它。
感谢您为我指明正确的方向！