我正在使用 CentOS 7，几天前我的 wifi 速度开始变慢。这些是我的一些输出（小于 1Mbps）：
uname -a
Linux lhost.ldomain 3.10.0-1127.18.2.el7.x86_64 #1 SMP Sun Jul 26 15:27:06 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
ifconfig
enp0s31f6: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether d4:81:d7:e8:0b:cc txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16 memory 0xef200000-ef220000
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 691156 bytes 541358280 (516.2 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 691156 bytes 541358280 (516.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:5e:a3:a5 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.2.107 netmask 255.255.255.0 broadcast 192.168.2.255
inet6 2003:cf:732:1de0:b426:4f6f:c778:b5db prefixlen 64 scopeid 0x0<global>
inet6 fe80::bb97:5650:6ef7:9493 prefixlen 64 scopeid 0x20<link>
ether 1c:4d:70:c0:fb:1b txqueuelen 1000 (Ethernet)
RX packets 1473038 bytes 943223376 (899.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 718634 bytes 181148123 (172.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lspci -knn | grep Net -A2
02:00.0 Network controller [0280]: Intel Corporation Wireless 8265 / 8275 [8086:24fd] (rev 78)
Subsystem: Intel Corporation Device [8086:0050]
Kernel driver in use: iwlwifi
iwconfig wlp2s0
wlp2s0 IEEE 802.11 ESSID: ***removed as suggested***
Mode:Managed Frequency:2.442 GHz Access Point: ***removed as suggested***
Bit Rate=144.4 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=55/70 Signal level=-55 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:14 Invalid misc:534 Missed beacon:0
答案1
根据提供的输出，您的 Wi-Fi 适配器以 144.4 Mb/s 的速度运行，具有非常不错的信噪比，这可能表明
- 暂时的硬件故障（尝试重新启动您的设备）
- 您的接入点存在某种问题（尝试重新启动 AP）
- 严重的 WiFi 拥塞（为您的手机运行任何 WiFi 分析仪，并检查是否有任何其他接入点共享您的射频 - 如果是这种情况，请更改它）
- 您没有使用VPN，是吗？如果是，请尝试断开/重新连接。
- 检查
dmesg输出中是否有警告/错误（它们将以 开头iwlwifi）。 - 尝试更新您的内核或/和 WiFi 固件。