802.11n slower than 802.11g?

[netsonicyxf]

My HP notebook has wifi link 5100 AGN with the latest driver. The card support both 802.11g and 802.11n mode.
The WL-500W is flashed with latested Oleg's firmware.

WL-500W wireless router use WPK2 TKIP+AES, Bandwidth=40Mhz. If I set router in 802.11g mode, the wireless card shows it work in 54M mode; if I set router in 802.11n mode, the wireless card shows it work in 135M mode.

Should 135M mode be quicker than 54M mode?

I download the same file from Microsoft using 802.11g or 802.11n, 802.11g gives me about 1000kB/sec, while 802.11n gives me 200kB/sec

802.11n = (1/5) 802.11g !!!!!!

How come "n" is slower than "g" ?

[wpte]

What if you transfer a big file between a wireless and a wired pc?
downloading a file from the internet has more uncertain variables that can decrease speed... testing with just a simple file transfer gives a better test result

I have the Intel Wireless WiFi Link 4965AGN, and I have the same things set up as you have, and I transfer files with +10mb/s to other pc's wich is impossible for 54G networks (54G max speed is 6,75mb/s)

[netsonicyxf]

Local Network Test result

802.11g: 2.5MB/sec
802.11n: 2.5-2.8MB/sec

[netsonicyxf]

What if you transfer a big file between a wireless and a wired pc?
downloading a file from the internet has more uncertain variables that can decrease speed... testing with just a simple file transfer gives a better test result

I have the Intel Wireless WiFi Link 4965AGN, and I have the same things set up as you have, and I transfer files with +10mb/s to other pc's wich is impossible for 54G networks (54G max speed is 6,75mb/s)

10mbits/s = (10/8)mBytes/sec = 1.25mB/sec ???

[wpte]

10mbits/s = (10/8)mBytes/sec = 1.25mB/sec ???

yes you got that right
there are 8 bits in a byte. and since network speeds usually come in bits, you got to calculate them to bytes

about the speeds... can you check with the command "top" in the console how mutch cpu usuage you have when transferring a file. the software irq deamon usually pops up with a big load when transferring loads for some reason.

[netsonicyxf]

What if you transfer a big file between a wireless and a wired pc?
downloading a file from the internet has more uncertain variables that can decrease speed... testing with just a simple file transfer gives a better test result

I have the Intel Wireless WiFi Link 4965AGN, and I have the same things set up as you have, and I transfer files with +10mb/s to other pc's wich is impossible for 54G networks (54G max speed is 6,75mb/s)

10mbits/sec = 1.25mBytes/sec for 802.11n and 6,75mb/s = 0.84mBytes/sec for 802.11g, It's a little bit slow if it's in home network.

[netsonicyxf]

I heard that other 2.4Ghz devices interfere with 11n performance, to avoid this, one possible solution is to change the channel.

But no matter what I select in WL-500W router, The channel is always 8.

[netsonicyxf]

Finally I figured that out, I switch the bandwidth to 20Mhz, the local network DL speed jump up to 7.4MB/sec

[wpte]

I heard that other 2.4Ghz devices interfere with 11n performance, to avoid this, one possible solution is to change the channel.

But no matter what I select in WL-500W router, The channel is always 8.

Finally I figured that out, I switch the bandwidth to 20Mhz, the local network DL speed jump up to 7.4MB/sec

They do usually. Putting it on 20mhz you're going to interfere with other AP's that don't support draft-N to the price that you do have good internet
40mhz usually works good with 802.11h which is known to work bad with your wlan card.
40 and 20 mhz also differ in performance in a different way:
40mhz: faster speeds for networks with a few clients
20mhz: faster speeds for networks with many clients


auto channel is probably the best... unless you have problems with the AP when you are further away from it.

I'm glad it's working