首先我想说的是，我是 Linux 新手（大约 2-3 周）。我购买了Maxesla 迷你 WiFi 适配器 1200M 802.11ac 双频 2.4/5GHz AC1200 无线网络适配器usb加密狗并安装rtl88x2bu 驱动程序已针对当前内核更新驱动程序（我遵循 DKMS 安装）。
当我在笔记本电脑上使用以太网电缆（或在我的手机上使用 wifi）时，我可以获得 450-500mbps 的完整速度，但使用此加密狗时，速度约为 200 mbps。我使用的是 Kubuntu 18.4 LTS，并且内置 wifi（2.4g）已启用，因为我不知道如何禁用它（不知道这是否有区别）。
先感谢您！
sudo lshw-类网络
*-network
description: Wireless interface
product: QCA9565 / AR9565 Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:01:00.0
logical name: wlp1s0
version: 01
serial: 18:cf:5e:35:79:cb
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=4.18.0-22-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:39 memory:f0c00000-f0c7ffff memory:f0c80000-f0c8ffff *-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: enp2s0
version: 0c
serial: c4:54:44:98:86:bf
size: 10Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list 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=half firmware=rtl8168g-2_0.0.1 02/06/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:31 ioport:2000(size=256) memory:f0b00000-f0b00fff memory:f0800000-f0803fff *-network
description: Wireless interface
physical id: 1
bus info: usb@1:1.1
logical name: wlx1cbfce387297
serial: 1c:bf:ce:38:72:97
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=rtl88x2bu ip=192.168.0.159 multicast=yes wireless=IEEE 802.11AC
系统盘
Bus 002 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 06cb:2970 Synaptics, Inc. touchpad
Bus 001 Device 003: ID 04f2:b469 Chicony Electronics Co., Ltd
Bus 001 Device 005: ID 0bda:b812 Realtek Semiconductor Corp.
Bus 001 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 003: ID 04e8:6860 Samsung Electronics Co., Ltd Galaxy (MTP)
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
串行通信
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1566
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mullins [Radeon R3 Graphics]
00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Kabini HDMI/DP Audio
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 156b
00:02.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:08.0 Encryption controller: Advanced Micro Devices, Inc. [AMD] Device 1537
00:10.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller (rev 11)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 40)
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 39)
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 39)
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 42)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD] FCH Azalia Controller (rev 02)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 11)
00:14.7 SD Host controller: Advanced Micro Devices, Inc. [AMD] FCH SD Flash Controller (rev 01)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1580
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1581
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1582
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1583
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1584
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1585
01:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
rfkill 列出全部
0: acer-wireless: Wireless LAN
Soft blocked: no
Hard blocked: no
1: acer-bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
4: phy2: Wireless LAN
Soft blocked: no
Hard blocked: no
编辑1：iwconfig
wlx1cbfce387297 IEEE 802.11AC ESSID:"Shabana_BETTER" Nickname:"<WIFI@REALTEK>"
Mode:Managed Frequency:5.745 GHz Access Point: B8:EC:A3:31:29:71
Bit Rate:867 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality=78/100 Signal level=53/100 Noise level=0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
enp2s0 no wireless extensions.
lo no wireless extensions.
wlp1s0 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=17 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
答案1
当我在笔记本电脑上使用以太网电缆（或在我的手机上使用 wifi）时，我可以获得 450-500mbps 的完整速度，但使用此加密狗时速度约为 200 mbps。
它有一个微小的天线，这导致信号接收很差。它有一个便宜的芯片组。我实际上惊讶您可以从中获得如此好的速度。
此外，它没有提到 USB3，这让我怀疑它是 USB2。USB2 的最大速度为 480Mb/s，实际上我注意到连接到 USB2 端口的千兆位 NIC 的速度往往约为 200-250Mb/s。
简而言之，你的速度比我预期的要快得多。你可能不会从该设备获得更多。买一个带有 USB3 和更好天线的设备。
此外，无线连接最多只能达到广告宣传速率的一半。当我的网卡宣布 867Mb/s 时，在良好条件下我可以获得大约 450Mb/s 的速度。这是 PCIe 上的 Intel 7265。