New hardware, old problem: stuck beacon when here is WiFi traffic

[Lev Serebryakov]

Hello, Freebsd-wireless.

 Now my router/AP is new hardware in new case, and it is not
overheating for sure.
 AP's WiFi card is Ubiquity SR-71E MiniPCIe card. Client is Intel
Advanced-N card. When AP sends stable stream of data (like RDesktop
connection from WiFi client to computer on wired network), AP gives
big pauses sometime, with "ath0: stuck beacon; resetting (bmiss count
4)" message. These pauses long enough to RDesktop client notice them
and try to reconnect. But no client dissociation occurs.

  Here is card:

ath0: <Atheros 9280> mem 0xd0000000-0xd000ffff irq 18 at device 0.0 on pci3
ath0: [HT] enabling HT modes
ath0: [HT] 1 stream STBC receive enabled
ath0: [HT] 1 stream STBC transmit enabled
ath0: [HT] 2 RX streams; 2 TX streams
ath0: AR9280 mac 128.2 RF5133 phy 13.0
ath0: 2GHz radio: 0x0000; 5GHz radio: 0x00c0

 Here is AP settings:

> ifconfig ath0
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 2290
        ether 00:15:6d:85:5f:fc
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11ng <hostap>
        status: running
> ifconfig wlan0
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:15:6d:85:5f:fc
        inet 192.168.135.1 netmask 0xffffff00 broadcast 192.168.135.255
        inet6 fe80::215:6dff:fe85:5ffc%wlan0 prefixlen 64 scopeid 0x6
        inet6 2001:470:923f:2::1 prefixlen 64
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11ng <hostap>
        status: running
        ssid home.serebryakov.spb.ru channel 3 (2422 MHz 11g ht/40+) bssid 00:15:6d:85:5f:fc
        regdomain ROW country DE ecm authmode WPA2/802.11i privacy MIXED
        deftxkey 3 AES-CCM 2:128-bit AES-CCM 3:128-bit txpower 30 scanvalid 60
        protmode CTS ampdulimit 64k ampdudensity 8 shortgi wme burst
        dtimperiod 1 -dfs

 Here is ath-related dmesg:

ath0: stuck beacon; resetting (bmiss count 4)
ath0: stuck beacon; resetting (bmiss count 4)
ath0: stuck beacon; resetting (bmiss count 4)
ath0: ath_bar_response: huh? bar_tx=0, bar_wait=0
ath0: stuck beacon; resetting (bmiss count 4)


 Here is my sources: "10.0-CURRENT FreeBSD 10.0-CURRENT #0 r249767M:
Mon Apr 22 22:22:47 MSK 2013".

 I have old router with AR9220 card, which I could use as spectrum
analyzer, if I'm giving proper instructions how to setup in in such
way :)

-- 
// Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>