Date: Wed, 7 Sep 2011 19:37:47 +0400 From: Lev Serebryakov <lev@serebryakov.spb.ru> To: freebsd-wireless@freebsd.org Subject: AP performance (again): txpower regulation Message-ID: <663133681.20110907193747@serebryakov.spb.ru>
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Hello, Freebsd-wireless. I return to experiments with my AP (FreeBSD based) again. I don't attach new (802.11n-capable) card yet, as I cannot buy U.FL->RP-SMA pigtails locally, but now I have two notebooks -- old Vayo and "new" MacBook with KisMAC installed. I've checked theory (by Bernhard Schmidt), that my AP is TOO powerful: set Vaio to run "iperf" forever, and monitor situation with MacBook (KisMAC). iperf output (each 2 seconds) looks like this: [ 3] 70.0-72.0 sec 1.00 MBytes 4.19 Mbits/sec [ 3] 72.0-74.0 sec 1.12 MBytes 4.72 Mbits/sec [ 3] 74.0-76.0 sec 1.25 MBytes 5.24 Mbits/sec [ 3] 76.0-78.0 sec 1.00 MBytes 4.19 Mbits/sec [ 3] 78.0-80.0 sec 1.12 MBytes 4.72 Mbits/sec ifconfig wlan0 list sta looks like ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG 00:18:de:08:e8:1d 2 9 11M 17.0 0 64411 15648 EPS AQE RSN W= ME 00:18:de:08:e8:1d 2 9 11M 18.0 0 64844 19088 EPS AQE RSN W= ME 00:18:de:08:e8:1d 2 9 11M 17.0 0 65283 22560 EPS AQE RSN W= ME 00:18:de:08:e8:1d 2 9 11M 17.5 0 169 25904 EPS AQE RSN W= ME 00:18:de:08:e8:1d 2 9 11M 16.5 0 668 29856 EPS AQE RSN W= ME 00:18:de:08:e8:1d 2 9 11M 17.0 0 1120 33440 EPS AQE RSN W= ME KisMAC (with Macbook placed near to Vaio) shows oscillation of signal powe= r from 40 no 0 back and forth, more "0" than "40" with average about 37. I don't know, is these zeroes meaningful, or it is result of channel hopping. I've tried to set "txpower" from 1 to 30 (1, 5, 10, 15, 30) and wait for 1 minute between settings. NOTHING CHANGES AT ALL. It seems, that txpower doesn't work on my hardware :( My next experiment is to boot 9.0-BETA1 on my AP. Hardware is: Senao EMP 8602 Plus-S Mini-PCI WiFi card. It is Atheros 5413 based 600mW card: ath0: <Atheros 5413> mem 0xa0060000-0xa006ffff irq 15 at device 17.0 on pci0 ath0: [ITHREAD] ath0: AR5413 mac 10.4 RF5413 phy 6.1 10dBi omni antenna. --=20 // Black Lion AKA Lev Serebryakov <lev@serebryakov.spb.ru>
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