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Aftab Hussain
Asked: 2019-06-21 04:09:46 +0800 CST

Wifi 加密狗的速度比宣传的要慢

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我想首先说我是 linux 新手（大约 2-3 周）。我购买了Maxesla Mini WiFi Adapter 1200M 802.11ac Dual Band 2.4/5GHz AC1200 Wireless Network Adapter usb dongle 并安装了针对当前内核驱动程序更新的 rtl88x2bu 驱动程序（我遵循了 DKMS 安装）。

在我的笔记本电脑上使用以太网电缆（或在我的手机上使用 wifi）时，我获得了 450-500mbps 的完整速度，但在使用这个加密狗时大约为 200mbps。我正在使用 Kubuntu 18.4 LTS 并启用了内置 wifi（2.4g），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

lsusb

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

lspci

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 列出所有

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
networking wireless drivers kubuntu 18.04

1 个回答

  1. Best Answer

    在我的笔记本电脑上使用以太网电缆（或在我的手机上使用 wifi）时，我获得了 450-500mbps 的完整速度，但在使用这个加密狗时大约为 200mbps。

    它有一个很小的天线，因此接收效果很差。它有一个便宜的芯片组。我真的很惊讶你能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 的速度往往在 200-250Mb/s 左右。

    所以简而言之。你的速度比我预期的要快得多。您可能不会再从该设备中获得更多信息。买一个带 USB3 和更好天线的。

    此外，无线充其量只能提供大约一半的广告费率。当我的 NIC 宣布 867Mb/s 时，在良好条件下我得到大约 450Mb/s。这是 PCIe 上的 Intel 7265。

    • 10

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