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I am running 10.04 LTS on a desktop PC with a Belkin G-Plus MIMO Wireless network card.

Ever since running Ubuntu on the machine I have noticed fairly slow network speeds (about half the speed I get when running the same card through Windows) I did some research I found out that by and large wireless network cards aren't that well supported on most Linux distros.

I was wondering though if there is anything I could be tweaking on the system that could help squeeze a little more out of the card?

Here is some more information

*-network:1

   description: Wireless interface
   physical id: 2
   logical name: wlan0
   serial: 00:1c:df:24:5e:54
   capabilities: ethernet physical wireless
   configuration: broadcast=yes ip=192.168.1.5 multicast=yes wireless=IEEE 802.11bg
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Cheers for the edit, looks a lot more question like now! –  Toby Aug 18 '10 at 21:32
2  
Is your router set for G-only or B/G Mixed? You'll get better performance with G-only. –  maco Aug 18 '10 at 21:49
    
Good question and I will check, although would that explain why under Windows the speed is much better? –  Toby Aug 18 '10 at 22:26
2  
What are you using to test the speed in each OS? –  Roger Pate Aug 19 '10 at 5:53
2  
What is the speed that you are getting? and how about if you just use firefox for a simple download? (you can install and use nload, nload -u H -U H wlan0 to measure speed. Speedtest are often flash, and flash for linux is quite sluggish. –  Source Lab Aug 19 '10 at 6:53

4 Answers 4

You didn't mention what kernel driver you're using for the card, but often tunables can be found in /sys/module/[driver]/. For example, my iwlagn driver shows this:

bryce@lynmouth:/sys/module/iwlagn$ ls

drivers/ holders/ initstate notes/ parameters/ refcnt sections/ srcversion version bryce@lynmouth:/sys/module/iwlagn$ ls parameters/ 11n_disable amsdu_size_8K antenna fw_restart4965 queues_num swcrypto 11n_disable50 amsdu_size_8K50 disable_hw_scan fw_restart50 queues_num50 swcrypto50

To find out some more info about what the parameters mean, look at the output of modinfo <driver>.

To change values of a parameter, just do "echo [number] > /sys/module/[driver]/parameters/[parameter]". Some parameters are read-only, so do a "cat .../[parameter]" to check that your new value was set.

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This isn't ideal but can you try a different wifi card? Wifi can be really hit and miss. At least this way you can determine if a different card makes any noticeable bandwidth differences.

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You can try enabling Jumbo Frames.

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Try running this command in a Terminal window (Ctrl+Alt+T):

sudo iwconfig wlan0 rate 54M
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