I noticed this problem in 11.10. My wifi worked great in 11.04, but as
soon as I migrated to 11.10, my wifi became unbearably slow. Running
iwconfig, I noticed that the "TX excessive retries" was incrementing
like crazy when browsing the web:
ubuntu@ubuntu:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"Wolfy"
Mode:Managed Frequency:2.462 GHz Access Point: 00:22:6B:7E:65:87
Bit Rate=72.2 Mb/s Tx-Power=14 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=70/70 Signal level=-29 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:179 Invalid misc:54 Missed beacon:0
ubuntu@ubuntu:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"Wolfy"
Mode:Managed Frequency:2.462 GHz Access Point: 00:22:6B:7E:65:87
Bit Rate=72.2 Mb/s Tx-Power=14 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=70/70 Signal level=-29 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:251 Invalid misc:64 Missed beacon:0
I disabled N-mode wifi using:
root@ubuntu:~# echo "options iwlagn 11n_disable=1" >
/etc/modprobe.d/iwlagn.conf
root@ubuntu:~# modprobe -v iwlagn
insmod /lib/modules/3.0.0-12-generic/kernel/net/wireless/cfg80211.ko
insmod /lib/modules/3.0.0-12-generic/kernel/net/mac80211/mac80211.ko
insmod
/lib/modules/3.0.0-12-generic/kernel/drivers/net/wireless/iwlwifi/iwlagn.ko
11n_disable=1
Running iwconfig then showed no TX retries.
root@ubuntu:~# iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan1 IEEE 802.11bg ESSID:"Wolfy"
Mode:Managed Frequency:2.462 GHz Access Point: 00:22:6B:7E:65:87
Bit Rate=2 Mb/s Tx-Power=14 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=70/70 Signal level=-31 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:41 Missed beacon:0
Under 12.04, though, I'm seeing a lot of "Invalid misc" retries.
I was really hoping that under 12.04 that this issue would be fixed. BTW,
this is on an Acer AspireOne netbook model AOD255E-13695.
Could this be router-related? I am using a Cisco WRT160N.
Bruce
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https://bugs.launchpad.net/bugs/984552
Title:
[8086:0085] iwlwifi intermittently losing connectivity
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