[Madwifi-users] SR5 Throughput issues

[wififi a. <wi...@ya...>]

I have problems with the SR5 Ubiquiti cards, 
I have a  8km link between two Debian Linux boxes using (1) SR5 Ubiquiti  cards each. 
When i transmit from siteA to siteB i get a throughput of 12Mbit aprox 
When i transmit from siteB to siteA i get a throughput of 6Mbit aprox 
 
The problem is when i transmit simultaneouly from siteB to siteA and  viceversa i get: 
700kbit from siteB to siteA, and 300kbit from siteA to siteB. 
 
What I need is to get at least 6Mbit from siteA to siteB and 6Mbit from  siteB to siteA when i transmit simultaneously on both directions. 
I am making the test by using an ftp server (proftpd) installed at  siteB, i am connecting a client laptop at siteA. 
I am using WDS mode and bridge-utils to create a wireless bridge between  eth0,ath0,ath1. 
 
I setted the diversity, antenna and distance: 
sysctl -w dev.wifi0.diversity=0 
sysctl -w dev.wifi0.txantenna=2 
sysctl -w dev.wifi0.rxantenna=2 
athctrl -d 9000 
 
I setted the txpower and frecuency: 
/usr/local/sbin/iwconfig ath0 txpower 17 
/usr/local/sbin/iwconfig ath0 channel 100 
 
Of course, the first thing that i did was loading the card driver: 
/sbin/modprobe ath_pci autocreate=none countrycode=100 
 
dmesg output shows: 
ath_hal: 0.9.16.16 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413) 
ath_rate_sample: 1.2 (svn 1521) 
ath_pci: 0.9.4.5 (svn 1521) 
ACPI: PCI Interrupt 0000:00:14.0[A] -> Link [LNKB] -> GSI 11 (level,  low) -> IRQ 11 
wifi0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps 
wifi0: H/W encryption support: WEP AES AES_CCM TKIP 
wifi0: mac 5.9 phy 4.3 radio 3.6 
wifi0: Use hw queue 1 for WME_AC_BE traffic 
wifi0: Use hw queue 0 for WME_AC_BK traffic 
wifi0: Use hw queue 2 for WME_AC_VI traffic 
wifi0: Use hw queue 3 for WME_AC_VO traffic 
wifi0: Use hw queue 8 for CAB traffic 
wifi0: Use hw queue 9 for beacons 
wifi0: Atheros 5212: mem=0xde000000, irq=11 
 
 
Can you help me figure out what is causing this strange behavior? 
Thanx
Lucy
 
 		
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