#21651: Ath9k wifi broken (at least on some devices) in chaos calmer, please add
warnings on release notes
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Reporter: anonymous | Owner: developers
Type: defect | Status: closed
Priority: high | Milestone:
Component: kernel | Version: Trunk
Resolution: wontfix | Keywords:
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Comment (by bluse):
Hi all,
I do see the same issue on two of my office APs (TP-Link TL-WR2543N/ND v1)
based on ath9k 3x3 ... after a couple of day in proper operation, they
start to increase the latency even between ping packets from client to AP
in the order of seconds. And a wifi down & up resolves the issue for the
next couple of days. So lets try to fix this. What do we know so far:
symptoms:
-ath9k in AP mode runs for a couple of days fine before latency increases
up to multiple seconds
affected hardware:
-evidence that ath9k with WRT160NL and TP-Link TL-WR2543N/ND v1 show this
issue
current workaround:
-wifi restart (once a day per cron job)
or
-to turn of ANI by "echo 0 > /sys/kernel/debug/ieee80211/phy0/ath9k/ani"
but which will decrease rx sensivity and therfore wireless coverage
how to reproduce:
-no instant process known to triggers this latency issue right away, until
now someone can only waint until this state come up
next trouble shooting steps:
-enable ANI on AP (is should be by default)
-enable ANI debugging (ATH_DBG_ANI) and collect output for further
investigation (e.g. via syslogd) (echo 0x00000040 >
/sys/kernel/debug/ieee80211/phy0/ath9k/debug)
-dedicated WiFi client that permanetly pings the AP and log the respone
time
(until the effected APs run into this latency issue)
I try to check this in the next days, but helping hands are welcome.
Greetings Bluse
--
Ticket URL: <https://dev.openwrt.org/ticket/21651#comment:10>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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