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#1 2013-09-18 23:53:32

fauria
Member
Registered: 2013-09-18
Posts: 1

Wifi rate extremely slow

Hi!

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).

$ lsusb
...
Bus 001 Device 004: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
...
$ iwconfig wlan0
...
Mode:Managed  Frequency:2.437 GHz  Access Point...
Bit Rate:54 Mb/s   Sensitivity:0/0
...
$ 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
$ iwlist modulation
wlan0     unknown modulation information.

However,

$ 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.

$ 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!

Last edited by fauria (2013-09-19 00:00:27)

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#2 2013-09-19 00:45:45

karol
Archivist
Registered: 2009-05-06
Posts: 25,423

Re: Wifi rate extremely slow

Have you asked on the Arch Linux ARM forum? Maybe it's a RasPi-specific issue.
http://archlinuxarm.org/forum/

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#3 2013-09-19 02:07:41

WonderWoofy
Member
From: Los Gatos, CA
Registered: 2012-05-19
Posts: 8,412

Re: Wifi rate extremely slow

As karol said, it may be an ARM specific issue.  But I also want to point out that it is quite frequent that we see issues around here with crappy and unstable connections with Realtek devices in general.  My machine originally had a card that used the notorious rtl8192ce module, and it was possibly the shittiest thing I have ever experienced in terms of "working" wifi.

You should probably go ask on the ARM forums though, as maybe that might have a better idea (and certainly a greater percentage of users who have USB wifi).

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