Petar Bogdanovic wrote:
Hi,
I'm using an alix2c0 board with two winstron CM9 ath(4)-cards and
FreeBSD 7:
ifconfig ath0 (...) mediaopt hostap mode 11a channel 36 ssid sn.a
-bgscan
ifconfig ath1 (...) mediaopt hostap mode 11g channel 11 ssid sn.g
-bgscan
When I try to raise the traffic (i.e. dd | ssh AP dd) my Linux
wpa_supplicant drops the connection and has to reassociate. This however
does not work immediately; The supplicant fails a few times before
reconnecting:
<2>CTRL-EVENT-CONNECTED - Connection to 00:0b:0b:06:0d:09 completed
(reauth) [id=0 id_str=]
<2>CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
<2>Trying to associate with 00:0b:0b:06:0d:09 (SSID='sn.a' freq=5320
MHz)
<2>Authentication with 00:0b:0b:06:0d:09 timed out.
<2>Trying to associate with 00:0b:0b:06:0d:09 (SSID='sn.a' freq=5320
MHz)
<2>Authentication with 00:0b:0b:06:0d:09 timed out.
<2>Trying to associate with 00:0b:0b:06:0d:09 (SSID='sn.a' freq=5320
MHz)
<2>Authentication with 00:0b:0b:06:0d:09 timed out.
<2>Trying to associate with 00:0b:0b:06:0d:09 (SSID='sn.a' freq=5320
MHz)
<2>Authentication with 00:0b:0b:06:0d:09 timed out.
<2>Trying to associate with 00:0b:0b:06:0d:09 (SSID='sn.a' freq=5320
MHz)
<2>Authentication with 00:0b:0b:06:0d:09 timed out.
<2>Trying to associate with 00:0b:0b:06:0d:09 (SSID='sn.a' freq=5320
MHz)
<2>Authentication with 00:0b:0b:06:0d:09 timed out.
<2>Trying to associate with 00:0b:0b:06:0d:09 (SSID='sn.a' freq=5320
MHz)
<2>Associated with 00:0b:0b:06:0d:09
<2>WPA: Key negotiation completed with 00:0b:0b:06:0d:09 [PTK=CCMP
GTK=CCMP]
<2>CTRL-EVENT-CONNECTED - Connection to 00:0b:0b:06:0d:09 completed
(reauth) [id=0 id_str=]
This happens more on the 11a than on the 11g network. When I'm next to
the AP, the timeouts are almost gone but they still happen. (My laptop
is just one room away from the AP). Here is the athstats-output of ath0
(11a):
# ./athstats -i ath0
481546 data frames received
330669 data frames transmit
13395 tx frames with an alternate rate
78558 long on-chip tx retries
1431 tx failed 'cuz too many retries
36M current transmit rate
78 tx management frames
3 tx frames discarded prior to association
45 tx frames with no ack marked
2894 rx failed 'cuz of bad CRC
2 rx failed 'cuz decryption
92711 rx failed 'cuz of PHY err
92708 OFDM timing
3 OFDM restart
318332 beacons transmitted
1111 periodic calibrations
2 rfgain value change
22 rssi of last ack
23 avg recv rssi
-96 rx noise floor
2530 switched default/rx antenna
Antenna profile:
[1] tx 173364 rx 123068
[2] tx 155874 rx 358671
So the obvious question is whether your system config has enough
isolation of the radios for them not to impact each other? I have no
experience with Alix boards but it's not uncommon for there to be power
and signal issues when operating multiple radios in an enclosure (and
yes, even with the radios on different bands).
You don't indicate what you've done to diagnose this problem. Have you
verified the packets are present in the air? Have you traced packets
and/or phy errors around the time of the problem? Does turning off one
radio give you stable operation? Have you tried different channels?
Have you tried different boards?
All this is well known to me, since I had NetBSD running on this device
for months and it suffered the same problems -- it was even worse, the
timeouts occured every few minutes. Back then, it seemed that ath had
some interrupt problems:
ath0: device timeout
as David Young from NetBSD noticed in his mail some time ago:
http://mail-index.netbsd.org/tech-net/2007/11/29/0001.html
FreeBSD doesn't seem to have this `device timeouts'. I don't see any in
/var/log/messages and there are none when I'm connected to the device
over a serial port.
I'm a bit lost here, but ready to debug if someone knows more.
netbsd's code base is many _years_ out of date wrt freebsd; comparing
operation of the two systems is unlikely to be useful.
Sam
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