由於頻繁出現不穩定問題,我正在嘗試降低Atheros TP-Link TL-WN821N v3 USB WiFi 適配器上的連接比特率(報告的連接速度降至1Mb/s,並且我必須以物理方式重新連接適配器才能重新獲得連接) )。我知道這是該設備的一個常見問題,並且我已經嘗試了所有我能想到的方法來修復它,包括使用 linux-backports 的驅動程式;編譯並安裝自訂韌體(遵循https://wiki.debian.org/ath9k_htc#fw-free)和(作為最後的手段)使用 ndiswrapper。
使用ndiswrapper時,wifi適配器穩定,以54Mb/s的g模式運作(而使用預設的ath9k_htc模組時,適配器以n模式連接,比特率不斷波動)。不幸的是,透過這種設置,我必須只使用一個核心來運行我的處理器,因為將 SMP 與 ndiswrapper 一起使用會導致我的系統出現核心錯誤。
因此,我想使用 ath9k_htc 模組將位元率鎖定為 54Mb/s(或更低,如果需要)以確保連接穩定性。
我嘗試過“sudo iwconfig wlan0 速率 54M”;該命令運行時沒有錯誤,但是當我使用“sudo iwlist wlan0 bitrate”檢查比特率時,該命令返回:
wlan0 unknown bit-rate information.
Current Bit Rate:78 Mb/s
有任何想法嗎?以下是有關我的設定的一些資訊(希望相關):
使用網路管理器的 Xubuntu (12.04.3) 64 位元(核心 3.2.0-55.85-generic)。我的路由器來自 Virgin Media,VMDG480。
lshw -C network :
*-network
description: Wireless interface
physical id: 1
bus info: usb@1:4
logical name: wlan0
serial: 74:ea:3a:8f:16:b6
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=ath9k_htc driverversion=3.2.0-55 firmware=1.3 ip=192.168.0.9 link=yes multicast=yes wireless=IEEE 802.11bgn
lsusb -v:
Bus 001 Device 003: ID 0cf3:7015 Atheros Communications, Inc. TP-Link TL-WN821N v3 802.11n [Atheros AR7010+AR9287]
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 255 Vendor Specific Subclass
bDeviceProtocol 255 Vendor Specific Protocol
bMaxPacketSize0 64
idVendor 0x0cf3 Atheros Communications, Inc.
idProduct 0x7015 TP-Link TL-WN821N v3 802.11n [Atheros AR7010+AR9287]
bcdDevice 2.02
iManufacturer 16 ATHEROS
iProduct 32 UB95
iSerial 48 12345
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 60
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 6
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x05 EP 5 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x06 EP 6 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 255 Vendor Specific Subclass
bDeviceProtocol 255 Vendor Specific Protocol
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
iwlist wlan0 scanning:
wlan0 Scan completed :
Cell 01 - Address: C4:3D:C7:3A:1F:5D
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=37/70 Signal level=-73 dBm
Encryption key:on
ESSID:"my essid"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=00000070cca77186
Extra: Last beacon: 5588ms ago
IE: Unknown: 0007756E69636F726E
IE: Unknown: 010882848B962430486C
IE: Unknown: 030101
IE: Unknown: 2A0100
IE: Unknown: 2F0100
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: 32040C121860
IE: Unknown: 2D1AFC181BFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D1601080400000000000000000000000000000000000000
IE: Unknown: DD7E0050F204104A0001101044000102103B00010310470010F99C335D7BAC57FB00137DFA79600220102100074E657467656172102300074E6574676561721024000631323334353610420007303030303030311054000800060050F20400011011000743473331303144100800022008103C0001011049000600372A000120
IE: Unknown: DD090010180203F02C0000
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
iwconfig:
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"my essid"
Mode:Managed Frequency:2.412 GHz Access Point: C4:3D:C7:3A:1F:5D
Bit Rate=78 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=36/70 Signal level=-74 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0,
答案1
我沒有這個硬件,所以無法測試,但是,看來速率是由韌體決定的。已經有補丁韌體了這裡這應該適用於核心 3.2.0-55.85-generic,或許也適用於更高版本的核心。
引用貝菲尼蒂夫
您可以在 patch/AR9271/firmware/htc_9271.fw 下找到使用 MCS3(26mbit/s)作為注入速率的預編譯韌體。將此檔案複製到 /lib/firmware 並重新插入卡片以使用修改後的韌體。如果您想以不同的注入速率編譯韌體,您可以查看我提供的補丁。最簡單的方法是用所需注入速率的副本來取代清單中的第一行。為 Linux 編譯韌體的說明在韌體倉庫。
安裝韌體後,只需重新插入 USB 轉接器即可使用。
資料來源:
https://github.com/qca/open-ath9k-htc-firmware/blob/master/README
編輯:作為@pandalion98指出在這則評論可以找到正在討論的補丁這裡。
答案2
使用 iw 代替:
iw wlan0 set bitrates legacy-2.4 9
在建立連線之前