Hello Helmut, I repeated the test with some more systematic to get a chance to get a deeper view on what is going on. 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 is 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: rt2860 based pci device (Linksys WMP600N) with compat-wireless-3.3-rc1-2 with all recent patches incl. "mac80211: revert: retry sending failed BAR frames later instead of tearing down aggr" with linux 3.1.4 / 64 bit smp. 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 desk chair TCP_STREAM STA -> AP 57.10 TCP_STREAM STA -> AP 55.22 TCP_STREAM STA -> AP 2.52 49.97 TCP_STREAM STA -> AP 2.84 49.94 TCP_STREAM STA -> AP 3.82 47.09 TCP_STREAM STA -> AP 4.27 47.57 TCP_STREAM STA -> AP 2.28 48.89 TCP_MAERTS AP -> STA 65.39 TCP_MAERTS AP -> STA 91.65 TCP_MAERTS AP -> STA 14.06 51.07 TCP_MAERTS AP -> STA 6.55 59.78 TCP_MAERTS AP -> STA 18.87 49.62 TCP_MAERTS AP -> STA 10.73 56.63 TCP_MAERTS AP -> STA 30.28 35.33 TCP_STREAM STA -> AP TCP_MAERTS AP -> STA 31.65 32.83 TCP_STREAM STA -> AP TCP_MAERTS AP -> STA 32.05 34.23 TCP_STREAM STA -> AP TCP_STREAM AP -> STA 0.12 66.23 TCP_MAERTS STA -> AP TCP_STREAM AP -> STA 0.10 69.89 TCP_MAERTS STA -> AP ---------------------------------------------------------------------- The position of the notebooks was changed: ath9k rt3572 chair desk TCP_STREAM STA -> AP 29.27 TCP_STREAM STA -> AP 55.79 TCP_STREAM STA -> AP interrupted 56.32 system call TCP_STREAM STA -> AP interrupted 55.65 system call TCP_MAERTS AP -> STA 80.73 TCP_MAERTS AP -> STA 79.15 TCP_MAERTS AP -> STA 17.13 62.02 TCP_MAERTS AP -> STA 15.14 63.92 TCP_MAERTS AP -> STA 12.53 66.41 TCP_MAERTS AP -> STA 11.95 66.17 TCP_MAERTS AP -> STA 8.44 50.19 TCP_STREAM STA -> AP TCP_MAERTS AP -> STA 9.31 49.67 TCP_STREAM STA -> AP TCP_MAERTS AP -> STA 11.24 46.72 TCP_STREAM STA -> AP TCP_STREAM AP -> STA 0.96 74.82 TCP_MAERTS STA -> AP TCP_STREAM AP -> STA 0.01 80.22 TCP_MAERTS STA -> AP I'll try to repeat the complete test with another AP. Regards, Andreas -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
