FS#373 - ath9k: high load >10

[openwrt-bot]

bittorf:

Supply the following if possible:

• Device problem occurs on
• Software versions of LEDE release, packages, etc.
• Steps to reproduce

with e.g. r2805 on a 'TP-LINK TL-WR1043ND' sometimes i can see:

# top Mem: 24448K used, 3492K free, 5468K shrd, 448K buff, 6512K cached CPU: 0% usr 100% sys 0% nic 0% idle 0% io 0% irq 0% sirq Load average: 8.80 8.48 7.93 6/48 7243 [...] no task >10%

see the "100% sys" - sometimes load goes >25.
there is no memory pressure and nothing in the log.

when doing 'wifi down' it seems to hang forever.
sometimes it goes away without doing anything.
wifi-mode is adhoc+ap - see the config:

root@exWachturm-drucker:~ :) uci show wireless wireless.radio0=wifi-device wireless.radio0.type='mac80211' wireless.radio0.country='US' wireless.radio0.frag='off' wireless.radio0.path='platform/ath9k' wireless.radio0.htmode='HT20' wireless.radio0.chanbw='20' wireless.radio0.channel='5' wireless.radio0.distance='100' wireless.radio0.beacon_int='125' wireless.radio0.txpower='23' wireless.radio0.hwmode='11ng'

wireless.@wifi-iface[0]=wifi-iface
wireless.@wifi-iface[0].device='radio0'
wireless.@wifi-iface[0].network='wlanadhoc'
wireless.@wifi-iface[0].mode='adhoc'
wireless.@wifi-iface[0].macaddr='f4:ec:38:9d:86:36'
wireless.@wifi-iface[0].mcast_rate='6000'
wireless.@wifi-iface[0].bssid='02:ca:ff:ee:ba:be'
wireless.@wifi-iface[0].ssid='ffintern.2GHz'

wireless.@wifi-iface[1]=wifi-iface
wireless.@wifi-iface[1].device='radio0'
wireless.@wifi-iface[1].network='wlan'
wireless.@wifi-iface[1].encryption='none'
wireless.@wifi-iface[1].mode='ap'
wireless.@wifi-iface[1].macaddr='f6:ec:38:9d:86:36'
wireless.@wifi-iface[1].disabled='0'
wireless.@wifi-iface[1].disassoc_low_ack='1'
wireless.@wifi-iface[1].ssid='weimar.freifunk.net'


[openwrt-bot]

bittorf:

what i also detected is, that sometimes the counters in /proc/interrupts are
stopping for some (e.g. 20) minutes and ofcourse wifi hangs during this period.

when debugging this with

echo 0x4409 >/sys/kernel/debug/ieee80211/phy0/ath9k/debug

i can see a lot of hangs and resets (~once per second)

[openwrt-bot]

IronicSven:

Hi Bastian,

this problem might be a duplicate of [[https://bugs.lede-project.org/index.php?do=details&task_id=13|FS#13 - Ath9k AP stays up for connected clients but doesn't show in scan on new ones]]

[openwrt-bot]

nbd:

Should be fixed in the latest version, please test

[openwrt-bot]

nbd:

No response, closing ticket...