Extremely slow WiFi

[fauria]

Hi!

As suggested by the Arch Linux forum, i post this question here:

I have installed Arch Linux on a Raspberry Pi. Everything works great, except for the wifi, which is terribly slow. (i get max rates of 100KB/s).

Im using a USB dongle called "edup Ultra-Mini Nano USB 2.0 802.11n 150 Mbit/s Wi-Fi/WLAN Wireless Network Adapter" (see http://elinux.org/RPi_USB_Wi-Fi_Adapters).

$this->bbcode_second_pass_code('', '
$ lsusb
...
Bus 001 Device 004: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
...
')

$this->bbcode_second_pass_code('', '
$ iwconfig wlan0
...
Mode:Managed Frequency:2.437 GHz Access Point...
Bit Rate:54 Mb/s Sensitivity:0/0
...
')

$this->bbcode_second_pass_code('', '
$ iwlist rate
wlan0 4 available bit-rates :
1 Mb/s
2 Mb/s
5.5 Mb/s
11 Mb/s
Current Bit Rate:54 Mb/s
')

$this->bbcode_second_pass_code('', '
$ iwlist modulation
wlan0 unknown modulation information.
')

However,

$this->bbcode_second_pass_code('', '
$ iw link
nl80211 not found.
')

iw seems not to work.

I tried to fix this by installing the package dkms-8192cu mentioned in the Wireless Setup howto, but did not solve the problem.

$this->bbcode_second_pass_code('', '
$ lsmod
Module Size Used by
...
8192cu 540608 0
...
')

The router is properly configured, as the rest of the devices on my network run at expected speeds.

Any ideas on why is this happening?

Thank you!