Slow download speed using Centrino Wireless-N 1030 with Ubuntu 12.04

[SEKarlos]

Hi Chili,

I switched UPnP off as advised, i couldn't find any reference to QoS in the Router settings however!

Here's the output from dmesg | grep 80211

ubuntu@ubuntu-Dell-System-XPS-L502X:~$ dmesg | grep 80211
[ 20.362773] cfg80211: Calling CRDA to update world regulatory domain
[ 20.571405] cfg80211: World regulatory domain updated:
[ 20.571408] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 20.571411] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 20.571413] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 20.571416] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 20.571418] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 20.571420] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 20.623315] cfg80211: Ignoring regulatory request Set by core since the driver uses its own custom regulatory domain
[ 20.625441] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
[31455.702135] cfg80211: All devices are disconnected, going to restore regulatory settings
[31455.702147] cfg80211: Restoring regulatory settings
[31455.702158] cfg80211: Calling CRDA to update world regulatory domain
[31455.711344] cfg80211: Ignoring regulatory request Set by core since the driver uses its own custom regulatory domain
[31455.711347] cfg80211: World regulatory domain updated:
[31455.711348] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[31455.711350] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[31455.711352] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[31455.711353] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[31455.711354] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[31455.711356] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[61768.018957] cfg80211: All devices are disconnected, going to restore regulatory settings
[61768.018969] cfg80211: Restoring regulatory settings
[61768.019009] cfg80211: Calling CRDA to update world regulatory domain
[61768.027058] cfg80211: Ignoring regulatory request Set by core since the driver uses its own custom regulatory domain
[61768.027066] cfg80211: World regulatory domain updated:
[61768.027070] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[61768.027075] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[61768.027080] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[61768.027085] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[61768.027089] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[61768.027094] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[70859.284170] cfg80211: All devices are disconnected, going to restore regulatory settings
[70859.284184] cfg80211: Restoring regulatory settings
[70859.284202] cfg80211: Calling CRDA to update world regulatory domain
[70859.294444] cfg80211: Ignoring regulatory request Set by core since the driver uses its own custom regulatory domain
[70859.294447] cfg80211: World regulatory domain updated:
[70859.294448] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[70859.294449] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[70859.294451] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[70859.294453] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[70859.294454] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[70859.294455] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[80575.717812] cfg80211: All devices are disconnected, going to restore regulatory settings
[80575.717827] cfg80211: Restoring regulatory settings
[80575.717845] cfg80211: Calling CRDA to update world regulatory domain
[80575.728596] cfg80211: Ignoring regulatory request Set by core since the driver uses its own custom regulatory domain
[80575.728606] cfg80211: World regulatory domain updated:
[80575.728610] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[80575.728617] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[80575.728624] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[80575.728630] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[80575.728636] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[80575.728641] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
ubuntu@ubuntu-Dell-System-XPS-L502X:~$

[chili555]

Looks awesome to me. It looks like you could also turn off N speeds in the router, unless you need it for other devices on the network.

cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)

[SEKarlos]

Thanks Chii,

What does 'cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)' tell us ?

Interestingly last week i was downloading at 120 Kib/s and this last few days it's dropped to 80 Kib/s.

[SEKarlos]

Sorry Chili, but what's N speeds? I can't find any reference to that in the router settings.

Thanks

[chili555]

It tells us that the router and the driver want to use the 5kHz band; i.e. N speeds if possible. N speeds have been very troublesome for the iwlwifi driver for some time. Often, Intel devices will connect but refuse to pass traffic unless N is disabled.

In my own case, my ancient, stone-age WRT54G with dd-wrt firmware, isn't even capable of N speeds and my iwlwifi device works just perfectly. Of course, I also can't stream high definition video without N, but, in my opinion, a laptop is a pretty poor way to watch a movie. But, hey, that's just me.

End rant.

[SEKarlos]

Thanks Chili,

It's a shame Linux isn't the norm instead Windows (one day maybe!).

Could you let me know how to disable the N speeds please?

[SEKarlos]

Is it the 'g only' setting ?

[chili555]

In the router, it's probably the B and G only setting. To disable it in the driver, do this: http://ubuntuforums.org/showthread.p...0#post12594190

[b-harip]

Thanks to this thread. I followed WildMan's instructions on the first page and my connections are not dropping off anymore.