> Hello list,
> i'm experiencing a very weak signal strength using ath9k and ar928x wireless
> in a wndr3700 router. I placed two of these approximately 3 meters line of
> sight of each other, and see signal strength of about -90dbm in mesh mode [1].
> The problem counts for sending and receiving, also in bss-mode. I posed my
> laptop approximately one meter away from the router as ap and measured the
> signal strength of the netgear firmware (openwrt 7.x with propietary driver)
> and openwrt (compat-wireless-2010-01-11, compat-wireless-2009-12-05), which
> gives me 20dbm difference [2].
> Using 'iwlist scan', original firmware shows 14 APs in my neighbourhood,
> openwrt shows 4.
[...]
I have taken a further look into the problem and realized, that 'iwconfig
txpower' has no affect to the signal strength. I also tried up-down or scanning
after change.
A test with hacked 'regd.c' (all set to 30dBm, no further limitations) also
showed no changes in signal quality. Power management is off.
A interesting detail is, that 5GHz (channel 52) also has quiet limited range,
but far better than 2,4GHz. 5GHz txpower is set to 30dBm by default.
Kernel is Linux OpenWrt 2.6.30.10 #10 Fri Jan 15 11:12:04 CET 2010 mips,
wireless now from compat-wireless-2010-01-13.
Some debug outputs after 10min of iperf traffic over mesh-link between two
identical wndr3700. I have seen no other 5GHz wifi in range.
1) 3 meters line of sight
2) 10 meters with thin glass/metal walls
(in both cases 2,4GHz wont communicate at all)
1)
[ 3] 0.0-600.0 sec 1.27 GBytes 18.2 Mbits/sec
cat /sys/kernel/debug/ath9k/phy1/rcstat
HT MCS Rate Success Retries XRetries PER
6.0: 0 0 0 0
9.0: 0 0 0 0
12.0: 0 0 0 0
18.0: 0 0 0 0
24.0: 1 0 0 0
36.0: 1 0 0 0
48.0: 286 19 0 0
54.0: 1160839 113918 26 7
Station 00:24:b2:58:fb:54 (on imesh5g)
inactive time: 570 ms
rx bytes: 2907897221
rx packets: 2001025
tx bytes: 422706850
tx packets: 1161637
signal: -67 dBm
tx bitrate: 54.0 MBit/s
mesh llid: 4935
mesh plid: 19635
mesh plink: ESTAB
2)
[ 3] 0.0-600.0 sec 294 MBytes 4.11 Mbits/sec
cat /sys/kernel/debug/ath9k/phy1/rcstat
HT MCS Rate Success Retries XRetries PER
6.0: 6936 7587 2100 0
9.0: 17804 18453 5797 0
12.0: 153370 112773 21194 13
18.0: 40331 104799 45526 49
24.0: 94 4822 7450 54
36.0: 0 15 21 82
48.0: 0 0 0 0
54.0: 0 0 0 0
Station 00:24:b2:58:fb:54 (on imesh5g)
inactive time: 800 ms
rx bytes: 670383000
rx packets: 442114
tx bytes: 18396981
tx packets: 218811
signal: -86 dBm
tx bitrate: 12.0 MBit/s
mesh llid: 57085
mesh plid: 19775
mesh plink: ESTAB
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