Kernel Bug Tracker – Bug 39922
WIFI becomes EXTREMELY slow ( ath9k ) making the connection unusable
Last modified: 2012-08-24 15:43:17 UTC
Created attachment 66432 [details]
lspci and some logs
My wifi connection becomes practically unusable after some random time. Reseting the connection sometimes helps for a while but most of the times I have to reboot the station to make it work properly again. Link speeds drop severely even though the signal is strong. This problem doesn't occur with the same hardware on windows. Tested with several different access points. No specific output in logs. Previously I suffered from the following bug: https://bugzilla.kernel.org/show_bug.cgi?id=27392 but now I don't get any error messages and the connection is much more stable ( it doesn't reset and packets are not lost it just becomes so slow that I can't even use SSH in my local network!)
kernel: Ubuntu 3.0.0-5.6-generic 3.0.0-rc7
Note: I did try other distributions but the effect was pretty much the same.
wlan0 IEEE 802.11bgn ESSID:"W"
Mode:Managed Frequency:2.467 GHz Access Point: 74:EA:3A:A2:DB:0C
Bit Rate=54 Mb/s Tx-Power=13 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Link Quality=49/70 Signal level=-61 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:27 Missed beacon:0
Still trying to figure-out how to get Atheros to look at bugs...
Does this problem persist with 3.2 kernels?
Yes it does and it can be related to the bug I've mentioned above even though I don't get err messages any more.
is this issue seen in a noisy environment?
i can try to recreate this issue, if you are able to recreate the issue you can try two things if it helps for you
1,sudo modprobe ath9k nohwcrypt=1 (incase your network is secured)
2./sys/kernel/debug/ieee80211/phy0/ath9k $ echo 1 > disable_ani
(disables ani related calibration)