I've just had my home internet upgraded to 50Mb/s down, but I can only get about 25 Mb/s down on my laptop over wifi. My phone gets about 45 Mb/s down over the same wifi and I get the full 50 Mb/s down when connected via Ethernet cable to the router, so I'm fairly sure the problem is on my laptop.

lspci says:

03:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] [8086:0085] (rev 34)

This makes me think that for some reason iwlwifi isn't driving the card as hard as it can go:

mwhudson@narsil:~$ iwlist wlan0 rate wlan0 unknown bit-rate information. Current Bit Rate:54 Mb/s

(The card can do 300Mb/s according to Intel's pages, as can my router). I see similar performance on the 2.4Ghz and 5Ghz bands (my phone only does 2.4Ghz).

I'm running up to date Ubuntu Saucy.


Well so it turns out 802.11n was disabled for some reason:

mwhudson@narsil:~$ sudo grep 11n -r /etc
/etc/modprobe.d/intel_11n_disable.conf:options iwlwifi 11n_disable=1

Moving that file out of the way got me the performance I expected.

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