The backport modules (2.6.31.15.28) (which I think is based upon stable
compat-wireless-2.6.32-rc4) help a lot. I've had stability for several
hours on those drivers with no DMA stalls
The only downside is the the connection speed tends to be 11Mb/sec or
lower with a 40Mhz 802.11n AP. Entirely the opposite of the over
aggressive speed optimisations of previous versions. However it does
work...
n...@acer-aspire-5536:~$ iw dev wlan0 station dump
Station 00:1c:df:a1:c7:2c (on wlan0)
inactive time: 17020 ms
rx bytes: 1152188
rx packets: 3393
tx bytes: 90321
tx packets: 582
signal: -12 dBm
tx bitrate: 11.0 MBit/s
I still get marked stalls in throughput when the Network manager
initiates a scan.
64 bytes from 192.168.2.1: icmp_seq=105 ttl=64 time=2.11 ms
64 bytes from 192.168.2.1: icmp_seq=106 ttl=64 time=2.11 ms
64 bytes from 192.168.2.1: icmp_seq=107 ttl=64 time=2.00 ms
64 bytes from 192.168.2.1: icmp_seq=108 ttl=64 time=4467 ms
64 bytes from 192.168.2.1: icmp_seq=109 ttl=64 time=3459 ms
64 bytes from 192.168.2.1: icmp_seq=110 ttl=64 time=2452 ms
64 bytes from 192.168.2.1: icmp_seq=111 ttl=64 time=1452 ms
64 bytes from 192.168.2.1: icmp_seq=112 ttl=64 time=452 ms
64 bytes from 192.168.2.1: icmp_seq=113 ttl=64 time=2.12 ms
64 bytes from 192.168.2.1: icmp_seq=114 ttl=64 time=2.43 ms
64 bytes from 192.168.2.1: icmp_seq=115 ttl=64 time=2.62 ms
Driver details:
n...@acer-aspire-5536:~$ sudo modinfo ath9k
filename: /lib/modules/2.6.31-15-generic/updates/cw/ath9k.ko
license: Dual BSD/GPL
description: Support for Atheros 802.11n wireless LAN cards.
author: Atheros Communications
srcversion: D775B5D263382E67C9CAD8F
alias: pci:v0000168Cd0000002Esv*sd*bc*sc*i*
alias: pci:v0000168Cd0000002Dsv*sd*bc*sc*i*
alias: pci:v0000168Cd0000002Bsv*sd*bc*sc*i*
alias: pci:v0000168Cd0000002Asv*sd*bc*sc*i*
alias: pci:v0000168Cd00000029sv*sd*bc*sc*i*
alias: pci:v0000168Cd00000027sv*sd*bc*sc*i*
alias: pci:v0000168Cd00000024sv*sd*bc*sc*i*
alias: pci:v0000168Cd00000023sv*sd*bc*sc*i*
depends: mac80211,led-class,ath,cfg80211
vermagic: 2.6.31-15-generic SMP mod_unload modversions
parm: debug:uint
parm: nohwcrypt:Disable hardware encryption (int)
n...@acer-aspire-5536:~$ sudo modinfo mac80211
filename: /lib/modules/2.6.31-15-generic/updates/cw/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: 52FBBF68ECFF38BB0E66029
depends: cfg80211
vermagic: 2.6.31-15-generic SMP mod_unload modversions
parm: ieee80211_default_rc_algo:Default rate control algorithm for
mac80211 to use (charp)
--
wpa_supplicant CTRL-EVENT-SCAN-RESULTS crashes ath9k wireless driver
https://bugs.launchpad.net/bugs/460886
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