我的无线适配器
Bus 006 Device 017: ID 0bda:8172 Realtek Semiconductor Corp. RTL8191SU 802.11n WLAN Adapter
lsmod 的输出
Module Size Used by
ctr 16384 0
ccm 20480 0
arc4 16384 0
rt2800usb 28672 0
rt2x00usb 24576 1 rt2800usb
rt2800lib 90112 1 rt2800usb
rt2x00lib 57344 3 rt2x00usb,rt2800lib,rt2800usb
mac80211 708608 3 rt2x00lib,rt2x00usb,rt2800lib
crc_ccitt 16384 1 rt2800lib
btrfs 937984 0
xor 24576 1 btrfs
raid6_pq 98304 1 btrfs
ufs 77824 0
qnx4 16384 0
hfsplus 106496 0
hfs 57344 0
minix 36864 0
ntfs 98304 0
msdos 20480 0
jfs 188416 0
xfs 917504 0
libcrc32c 16384 1 xfs
nls_iso8859_1 16384 0
uas 24576 0
usb_storage 69632 1 uas
pci_stub 16384 1
vboxpci 24576 0
vboxnetadp 28672 0
vboxnetflt 28672 0
vboxdrv 417792 3 vboxnetadp,vboxnetflt,vboxpci
cfg80211 524288 2 mac80211,rt2x00lib
snd_hda_codec_hdmi 53248 4
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
r8712u 184320 0
kvm_amd 61440 0
kvm 479232 1 kvm_amd
snd_rawmidi 32768 1 snd_seq_midi
crct10dif_pclmul 16384 0
snd_hda_codec_realtek 81920 1
crc32_pclmul 16384 0
snd_hda_codec_generic 69632 1 snd_hda_codec_realtek
snd_hda_intel 36864 6 snd_hda_codec_hdmi
snd_hda_controller 32768 1 snd_hda_intel
snd_hda_codec 143360 5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
snd_hwdep 20480 1 snd_hda_codec
aesni_intel 172032 0
snd_seq 65536 2 snd_seq_midi_event,snd_seq_midi
snd_pcm 106496 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
aes_x86_64 20480 1 aesni_intel
lrw 16384 1 aesni_intel
gf128mul 16384 1 lrw
glue_helper 16384 1 aesni_intel
ablk_helper 16384 1 aesni_intel
cryptd 20480 2 aesni_intel,ablk_helper
bnep 20480 2
rfcomm 69632 0
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
serio_raw 16384 0
k10temp 16384 0
snd_timer 32768 2 snd_pcm,snd_seq
bluetooth 491520 10 bnep,rfcomm
snd 86016 21 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device
i2c_piix4 24576 0
nouveau 1368064 4
mxm_wmi 16384 1 nouveau
wmi 20480 2 mxm_wmi,nouveau
ttm 94208 1 nouveau
drm_kms_helper 126976 1 nouveau
drm 344064 7 ttm,drm_kms_helper,nouveau
soundcore 16384 2 snd,snd_hda_codec
i2c_algo_bit 16384 1 nouveau
shpchp 40960 0
binfmt_misc 20480 1
8250_fintek 16384 0
video 20480 1 nouveau
mac_hid 16384 0
parport_pc 32768 1
ppdev 20480 0
lp 20480 0
parport 45056 3 lp,ppdev,parport_pc
pata_acpi 16384 0
hid_generic 16384 0
usbhid 53248 0
hid 110592 2 hid_generic,usbhid
pata_atiixp 16384 0
r8169 81920 0
mii 16384 1 r8169
ahci 36864 3
libahci 32768 1 ahci
我的网络连接速度上限为 5mbps，而相同距离内的其他机器可以达到 20。当我在另一台机器上使用该适配器时也会出现同样的问题。
sudo lsusb -v -d 0bda:8172 | grep bcdUSB
bcdUSB 2.00
bcdUSB 2.00
dmsg output
[438815.257964] usb 6-1: new high-speed USB device number 18 using ehci-pci
[438815.392953] usb 6-1: New USB device found, idVendor=0bda, idProduct=8172
[438815.392960] usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[438815.392964] usb 6-1: Product: RTL8191S WLAN Adapter
[438815.392967] usb 6-1: Manufacturer: Manufacturer Realtek
[438815.392970] usb 6-1: SerialNumber: 00e04c000001
[438815.393591] r8712u: Staging version
[438815.393621] r8712u: register rtl8712_netdev_ops to netdev_ops
[438815.393627] usb 6-1: r8712u: USB_SPEED_HIGH with 4 endpoints
[438815.395195] usb 6-1: r8712u: Boot from EFUSE: Autoload OK
[438815.809255] usb 6-1: r8712u: CustomerID = 0x000a
[438815.809261] usb 6-1: r8712u: MAC Address from efuse = e8:4e:06:1e:3e:2e
[438815.809265] usb 6-1: r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
[438816.546318] r8712u 6-1:1.0 wlan0: 1 RCR=0x153f00e
[438816.547037] r8712u 6-1:1.0 wlan0: 2 RCR=0x553f00e
uname -r
3.19.0-43-generic
iwlist wlan0 bitrate
wlan0 4 available bit-rates :
1 Mb/s
2 Mb/s
5.5 Mb/s
11 Mb/s
Current Bit Rate:150 Mb/s
lshw for the wlan
id:
network
description: Wireless interface
physical id:
1
bus info:
usb@6:1
logical name:
wlan0
serial: e8:4e:06:1e:3e:2e
capabilities: ethernet physical wireless
configuration:
broadcast = yes
driver = r8712u
ip = 192.168.1.103
multicast = yes
wireless = IEEE 802.11bgn