Re: ath9k get's completely knocked out by rt3572 device

[Andreas Hartmann <andihartmann@01019freenet.de>]

Hello all!

As promised, I repeated the test before with another AP. The destination
host of netperf was the same. See below!


The test was done using netperf with the following two calls:

netperf -t TCP_MAERTS -H host -l 60
netperf -t TCP_STREAM -H host -l 60


The test was done with two different notebooks as STA:

notebook ath9k:
built-in ar9285 device, intel core i5 processor, linux 3.2.1 / 64 bit
kernel.

notebook rt3572:
WUSB600Nv2 WLAN USB stick (inserted horizontally into the USB port of
the back of the notebook), intel celeron M processor, linux 2.6.37.6 /
32 bit kernel, Ralink rt5572sta.


AP:
Linksys WAP610N, connected to the host (destination of netperf) with
fast ethernet.


The network parameters are:
2,4 GHz, 40 MHz, WPA2 EAP-TLS, CCMP



The following chart should be read like this:

- one measurement / line: the device operates alone
- two measurements / line: both devices run exactly (+/- few ms) at the
  same time
- one direction of the data stream / line: both devices operate at the
  same direction
- two directions of the data stream / line: each device operates at the
  direction next to it


			10^6bits/s	10^6bits/s
			ath9k		rt3572
			table		chair

TCP_STREAM STA -> AP	33.12		
TCP_STREAM STA -> AP			74.32

TCP_STREAM STA -> AP	12.64		50.83
TCP_STREAM STA -> AP	11.96		52.44
TCP_STREAM STA -> AP	15.33		53.46
TCP_STREAM STA -> AP	12.52		51.03
TCP_STREAM STA -> AP	11.67		53.80


TCP_MAERTS AP -> STA			51,52
TCP_MAERTS AP -> STA	36.48
TCP_MAERTS AP -> STA	10.73		33.85
TCP_MAERTS AP -> STA	 2.93		45.38
TCP_MAERTS AP -> STA	 8.67		36.53
TCP_MAERTS AP -> STA	13.35		29.98
TCP_MAERTS AP -> STA	11.13		33.10


TCP_MAERTS AP -> STA	21.16		30.38	TCP_STREAM STA -> AP
TCP_MAERTS AP -> STA	22.86		26.76	TCP_STREAM STA -> AP
TCP_MAERTS AP -> STA	23.64		25.37	TCP_STREAM STA -> AP
TCP_MAERTS AP -> STA	22.45		27.95	TCP_STREAM STA -> AP


TCP_STREAM AP -> STA	 3.99		42.20	TCP_MAERTS STA -> AP
TCP_STREAM AP -> STA	13.24		28.40	TCP_MAERTS STA -> AP
TCP_STREAM AP -> STA	12.80		28.46	TCP_MAERTS STA -> AP
TCP_STREAM AP -> STA	12.78		28.63	TCP_MAERTS STA -> AP


----------------------------------------------------------------------

The position of the notebooks was changed:

			ath9k		rt3572
			chair		table

TCP_STREAM STA -> AP	49.00		
TCP_STREAM STA -> AP			76,32

TCP_STREAM STA -> AP	15.97		55.96
TCP_STREAM STA -> AP	18.96		49.79
TCP_STREAM STA -> AP	14.52		57.33
TCP_STREAM STA -> AP	20.04		51.52
TCP_STREAM STA -> AP	15.57		56.06


TCP_MAERTS AP -> STA			54.25
TCP_MAERTS AP -> STA	40.13

TCP_MAERTS AP -> STA	14.14		34.51
TCP_MAERTS AP -> STA	 9.72		40.47
TCP_MAERTS AP -> STA	 9.00		40.54
TCP_MAERTS AP -> STA	13.99		35.35


TCP_MAERTS AP -> STA	21.98		47.26	TCP_STREAM STA -> AP
TCP_MAERTS AP -> STA	16.07		53.88	TCP_STREAM STA -> AP
TCP_MAERTS AP -> STA	17.32		49.53	TCP_STREAM STA -> AP
TCP_MAERTS AP -> STA	17.08		56.57	TCP_STREAM STA -> AP
TCP_MAERTS AP -> STA	21.63		50.91	TCP_STREAM STA -> AP


TCP_STREAM AP -> STA	 1.58		49.03	TCP_MAERTS STA -> AP
TCP_STREAM AP -> STA	 5.36		46.49	TCP_MAERTS STA -> AP
TCP_STREAM AP -> STA	 8.71		40.88	TCP_MAERTS STA -> AP
TCP_STREAM AP -> STA	 4.72		45.95	TCP_MAERTS STA -> AP
TCP_STREAM AP -> STA	12,29		39.31	TCP_MAERTS STA -> AP
TCP_STREAM AP -> STA	 4.68		46.43	TCP_MAERTS STA -> AP



Regards,
Andreas