Originally Posted by qspb

Some good news.

Before trying to recompile wireless driver or going to NITdroid forum I decided to reflash my Nokia N9. You see, many errors and misconfiguration problems are possible due to updating the phone over the air several times, so it's certainly better to make a "clean install" of phone firmware. So I followed these instructions to zeroize and reflash my N9: http://talk.maemo.org/showpost.php?p...16&postcount=1 .

Then I turned on my phone, installed developer-mode, networking utilities (including wget), and redone all my measurments.
First I set up AP configuration with QoS disabled; here is a part of my hostapd config:

Code:

hw_mode=g
ieee80211n=1
ht_capab=[HT20+][SHORT-GI-20]
channel=6

I tried to download a large file and the average speed was ~ 2.6 M/s (according to wget output). It seemed to be usual 802.11g speed.
Then I edited hostapd config and enabled QoS:

Code:

ieee80211n=1
wmm_enabled=1
ht_capab=[HT20+][SHORT-GI-20]
channel=6

The result was exciting. Enabling QoS improved the speed, not reduced it. The average speed was ~ 2.9 M/s. Sometimes it jumped up to 3.1 M/s (!). Such a result is unreachable with 802.11g-only mode.
Okay, then I made hostapd use [HT40+] instead of [HT20+]. The speed reduced. It was ~ 1 M/s again. With QoS disabled it raised up to stable 2.6 M/s . And such a result isn't surprising, because according to iw output, N9's wireless module supports only HT20 and SHORT-GI-20 capabilities, so using QoS with HT40 results in reducing speed. I think it's quite normal.

But at least I've managed to get my 802.11n work properly with HT20 and QoS enabled. The speed is 2.9 - 3.1 M/s now (it's definetely higher than usual 802.11g speed), the connection is stable, so I'm able to use Internet, ssh and http file transfer without any problems. I'm very glad.

But I know that some other N9 users said they had no problems with their 802.11n routers.. maybe in neighbour topics on this forum. Can somebody evaluate actual Wi-Fi N speed in a similar way and post the results here so that we can compare different users' experience?

P.S. "M/s" means "Megabytes per a second" - it's not a bitrate, it's a real file transfer speed.