[ath9k-devel] Attempting to restart tx logic - no longer logged, still causing problems

[Bartek Knapek <atk9k@knapek.pl>]

Hi!

I am using ath9k in AP mode. Several times a day clients loose 
connectivity for a short while, which often causes e.g. the established 
TCP/IP sessions to be dropped.

When running 2.6.39.3 I was getting "Attempting to restart tx logic" 
each time the problem occurred. I have upgraded compat wireless to 
2011-07-28. Now I no longer see the entries in the logs, but I keep 
loosing connectivity as before.

It the problem known?
Are there any patches I could try?

I am using TL-WN781N on GA-H67E-USB3-B3, i3-2100T.

lspci for the wlan card says:
03:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless 
Network Adapter (PCI-Express) (rev 01)
         Subsystem: Atheros Communications Inc. Device 30a1
         Flags: bus master, fast devsel, latency 0, IRQ 18
         Memory at fbbf0000 (64-bit, non-prefetchable) [size=64K]
         Capabilities: [40] Power Management version 3
         Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit-
         Capabilities: [60] Express Legacy Endpoint, MSI 00
         Capabilities: [100] Advanced Error Reporting
         Capabilities: [140] Virtual Channel <?>
         Capabilities: [160] Device Serial Number 00-15-17-ff-ff-24-14-12
         Capabilities: [170] Power Budgeting <?>
         Kernel driver in use: ath9k
         Kernel modules: ath9k

Before upgrading compat I was seeing such entries in the logs:
[253951.809823] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f4990f3c pending frames: 1 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[253952.810527] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f4990f3c pending frames: 2 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[253953.811218] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f4990f3c pending frames: 2 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[253954.811923] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f4997aa8 pending frames: 2 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[253955.812627] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f4996c34 pending frames: 2 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[253996.841346] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f4996ef0 pending frames: 1 axq_acq empty: 1 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[253997.842036] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f49907d0 pending frames: 26 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[253998.842723] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f49989e4 pending frames: 52 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[253999.843441] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f49989e4 pending frames: 74 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[254000.844144] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f49989e4 pending frames: 76 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[254001.844840] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f499b0f4 pending frames: 83 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[254002.845548] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f4992a94 pending frames: 99 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.
[254003.846245] ath: txq: f4fdd9d8 axq_qnum: 2, mac80211_qnum: 2 
axq_link: f4994a9c pending frames: 103 axq_acq empty: 0 stopped: 0 
axq_depth: 0  Attempting to restart tx logic.

I am running 802.11n, according to the following hostapd.conf:
  interface=wlan0

  driver=nl80211
  logger_syslog=-1
  logger_syslog_level=2
  logger_stdout=-1
  logger_stdout_level=2
  dump_file=/tmp/hostapd.dump
  ctrl_interface=/var/run/hostapd
  ctrl_interface_group=0
  ssid=matylda
  country_code=PL
  ieee80211d=1
  hw_mode=g
  channel=1
  beacon_int=1000
  dtim_period=2
  max_num_sta=255
  rts_threshold=2347
  fragm_threshold=2346
  macaddr_acl=1
  accept_mac_file=/etc/hostapd.accept
  auth_algs=3
  ignore_broadcast_ssid=0
  wmm_enabled=1
  wmm_ac_bk_cwmin=4
  wmm_ac_bk_cwmax=10
  wmm_ac_bk_aifs=7
  wmm_ac_bk_txop_limit=0
  wmm_ac_bk_acm=0
  wmm_ac_be_aifs=3
  wmm_ac_be_cwmin=4
  wmm_ac_be_cwmax=10
  wmm_ac_be_txop_limit=0
  wmm_ac_be_acm=0
  wmm_ac_vi_aifs=2
  wmm_ac_vi_cwmin=3
  wmm_ac_vi_cwmax=4
  wmm_ac_vi_txop_limit=94
  wmm_ac_vi_acm=0
  wmm_ac_vo_aifs=2
  wmm_ac_vo_cwmin=2
  wmm_ac_vo_cwmax=3
  wmm_ac_vo_txop_limit=47
  wmm_ac_vo_acm=0
  ieee80211n=1
  ht_capab=[HT40-][HT40+][TX-STBC][RX-STBC1][DSSS_CCK-40]
  eapol_key_index_workaround=0
  own_ip_addr=127.0.0.1
  wpa=2
  wpa_psk=xxx
  wpa_key_mgmt=WPA-PSK
  wpa_pairwise=TKIP CCMP

BR/Bartek