performance ?! where is the problem...(?)

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Joe Cool 2010

15-09-2010 09:13:17


Finally I have now my wlan-connection -)
but I think it is too slow - maybe this is the max. speed with my pc....

here are some infos

wlan0 IEEE 802.11bgn ESSID"MYAP"
ModeManaged Frequency2.452 GHz Access Point 001122334455
Bit Rate=240 Mb/s Tx-Power=5 dBm
Retry long limit7 RTS throff Fragment throff
Encryption keyoff
Power Managementoff
Link Quality=44/70 Signal level=-66 dBm
Rx invalid nwid0 Rx invalid crypt0 Rx invalid frag0
Tx excessive retries0 Invalid misc0 Missed beacon0

240MB/s sounds good
For the link qualtity 44/70 and signal level -66dBm I haven't any compares to other systems.

My linux is
Linux mylin 2.6.36-rc4+ #12 SMP Tue Sep 14 072249 CEST 2010 i686 i686 i386 GNU/Linux
with 1GB RAM and single core with 2.4GHz (4799.71 BogoMIPS)
(Intel(R) Celeron(R) CPU 2.40GHz stepping 09 Brought up 1 CPUs)

The link is established to a D-Link DIR-655... (with WPA)

the max. transfer speed is only 4-5 MB/s ! (the distance is approx. 5m)

How can I get more??? with 240Mb/s I should get more....

Joe Cool 2010

18-09-2010 06:18:15

Some new information

Some tests give the result that the problem is not the wlan-link!

First I gave more power to the antenna (configuration in my AP),
then I checked the performance with an Win7 PC and an USB dongle
-> performance as expected 10-11 MB/s - distance to the AP is the same to my linux-system.

- link quality is okay - signal level -58dbm

2349 root -51 0 0 0 0 S 35.1 0.0 031.52 irq/17-000000

CPU=35% if a file copy is running! transfer speed 5.5MB/s

Now I think there is weakness in CPU / PCI-BUS / driver .....

Maybe somebody can confirm this or can give me a hint or solution.

Every helpfull message is welcome!!! ;-)


26-09-2010 11:49:33

One thing that hinders performance in rt2800pci is that RX aggregation is not implemented yet.


01-10-2010 12:49:12

I've posted a few patches that should increase performance in rt2800pci

Enable RX aggregation (however I don't know if that only works on SoC devices)

Improve rate control behavior

Could you please try if these patches improve the performance on your PCI card as well? Especially the RX agg patch would be interesting.



20-10-2010 02:20:59

What about rt61pci?? Using compat-wireless-10-15 and kernel I get soft-irq taking up nearly half my cpu and sys the other half. Is that OK!? 200MHz MIPS, but still.. testing Ralink SoftAP driver with kernel i get maybe 30% max of sys cpu, nothing listed for sirq...

I disabled the LEDs class hoping for improvement... maybe was a bit..

The LEDs don't seem to work either way, but that's a whole 'nother story.