各位大佬好，我最近碰到个挺头疼的问题：同一台电脑，Windows系统下网络测速完全正常，但切换到Linux之后，网络速度就明显变慢了。我先把相关的硬件和网卡配置信息贴出来，看看有没有朋友能给点排查思路：

网卡硬件信息 #

用lspci命令查询到的网卡型号：

04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 04)

网卡详细配置（ethtool输出） #

运行ethtool enp4s0得到的完整配置信息：

Settings for enp4s0:
Supported ports: [ TP    MII ]
Supported link modes:   10baseT/Half 10baseT/Full
                        100baseT/Half 100baseT/Full
                        1000baseT/Full
                        2500baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes:  10baseT/Half 10baseT/Full
                        100baseT/Half 100baseT/Full
                        1000baseT/Full
                        2500baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes:  100baseT/Half 100baseT/Full
                                     1000baseT/Half 1000baseT/Full
                                     2500baseT/Full
Link partner advertised pause frame use: No
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 2500Mb/s
Duplex: Full
Auto-negotiation: on
master-slave cfg: preferred slave
master-slave status: slave
Port: Twisted Pair
PHYAD: 0
Transceiver: external
MDI-X: Unknown
Supports Wake-on: pumbg
Wake-on: d
Link detected: yes

后续进展更新 #

UPDATE: 经过初步排查，这个问题好像和我的ISP有关——虽然Windows下速度没问题，但Linux这边的慢速情况应该是ISP层面的原因导致的。等我确认更多细节后，就会把这个问题标记为已解决。

备注：内容来源于stack exchange，提问作者Kevin Remisoski