Good morning, ath9k devs and OpenWrt-users.
Please excuse the cross post, not something we normally do.
We have a particularly difficult situation in which we are trying to
achieve a stable link over 1.2 miles with the Ubiquiti M900 which uses
the AR9280 and thus 2X2 MIMO.
We loaded OpenWrt trunk as a scientific control when we observed
spontaneous reboots on AirOS 5.2.1 and 5.3.
There is only one tree in the Fresnel zone and it has few leaves this
time of year. An unlicensed SCADA operation is a few miles away,
using omnis at six water towers.
To try to reduce the number of variables, we note with interest
MikroTik's statement below the sig and ask folks on ath9k-devel and
OpenWrt-users how to configure, e.g., OpenWrt to use only chain 0.
Excerpts of dmesg for the AP are also below the sig. dmesg on the CPE is quiet.
If the objective of this email is unrelated, please offer any advice
to achieve desired operation.
THANKS in advance for your help --- it is fully appreciated.
Kind regards/ldv
--
Larry Vaden, CoFounder
Internet Texoma, Inc.
Serving Rural Texomaland Since 1995
We Care About Your Connection!
===From Mikrotik's manual on the SXT:
If you want to overcome certain obstacles or interference by using
only one polarization in 802.11a mode,
you can switch off chain1 of the wireless device. When chain0 is used,
the device is horizontally polarized
when mounted as indicated in the Mounting section of this document. If
you wish to use vertical polarization,
turn the device 90 degrees to that the mounting bracket attachment is
parallel to the ground. Chain1 can't
be used separately. Switching off chain1 to use only one polarization
can be done in the RouterOS wireless
configuration menu.
ath: Failed to stop TX DMA!
ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020
ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020
iperf output (last few lines of 6 hour run):
[ 3] 20340.0-20400.0 sec 4.50 MBytes 629 Kbits/sec
[ 3] 20400.0-20460.0 sec 640 KBytes 87.4 Kbits/sec
[ 3] 20460.0-20520.0 sec 3.63 MBytes 507 Kbits/sec
[ 3] 20520.0-20580.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 20580.0-20640.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 20640.0-20700.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 20700.0-20760.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 20760.0-20820.0 sec 128 KBytes 17.5 Kbits/sec
[ 3] 20820.0-20880.0 sec 7.00 MBytes 979 Kbits/sec
[ 3] 20880.0-20940.0 sec 128 KBytes 17.5 Kbits/sec
[ 3] 20940.0-21000.0 sec 1.88 MBytes 262 Kbits/sec
[ 3] 21000.0-21060.0 sec 256 KBytes 35.0 Kbits/sec
[ 3] 21060.0-21120.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 21120.0-21180.0 sec 768 KBytes 105 Kbits/sec
[ 3] 21180.0-21240.0 sec 1.75 MBytes 245 Kbits/sec
[ 3] 21240.0-21300.0 sec 384 KBytes 52.4 Kbits/sec
[ 3] 21300.0-21360.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 21360.0-21420.0 sec 1.38 MBytes 192 Kbits/sec
[ 3] 21420.0-21480.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 21480.0-21540.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 21540.0-21600.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 0.0-21643.1 sec 2.22 GBytes 883 Kbits/sec
root@OpenWrt:~# uname -a
Linux OpenWrt 2.6.37.4 #1 Sat Mar 26 06:57:51 CET 2011 mips GNU/Linux
root@OpenWrt:~# cat /etc/banner
_______ ________ __
| |.-----.-----.-----.| | | |.----.| |_
| - || _ | -__| || | | || _|| _|
|_______|| __|_____|__|__||________||__| |____|
|__| W I R E L E S S F R E E D O M
Backfire (10.03.1-rc4, r24045) --------------------
* 1/3 shot Kahlua In a shot glass, layer Kahlua
* 1/3 shot Bailey's on the bottom, then Bailey's,
* 1/3 shot Vodka then Vodka.
---------------------------------------------------
root@OpenWrt:~#
Please note /etc/banner does not reflect the correct rxxxxx (IMHO), as
this is the 26 Mar edition of OpenWrt via sysupgrade.
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