linux-kernel - Re: [regression][2.6.38-rcX][net][iwlagn] WiFi signal after period of time tanks causing contant drops

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Date:	Wed, 9 Feb 2011 23:15:26 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Shawn Starr <shawn.starr@...ers.com>
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: [regression][2.6.38-rcX][net][iwlagn] WiFi signal after period
 of time tanks causing contant drops

(cc linux-wireless)

On Sun, 06 Feb 2011 22:54 -0500 Shawn Starr <shawn.starr@...ers.com> wrote:

> 
> Using a Intel Corporation PRO/Wireless 5100 AGN [Shiloh] card after rebooting 
> and a period of of seveal hours signal begins to drop to low levels:
> 
> 
> wlan0     IEEE 802.11abgn  ESSID:"XXXXXXXX"  
>           Mode:Managed  Frequency:2.462 GHz  Access Point: AA:BB:CC:DD:EE:FF   
>           Bit Rate=11 Mb/s   Tx-Power=15 dBm   
>           Retry  long limit:7   RTS thr:off   Fragment thr:off
>           Power Management:off
>           Link Quality=12/70  Signal level=-98 dBm  
>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>           Tx excessive retries:0  Invalid misc:35   Missed beacon:0
> 
> ...
> 
>           Link Quality=12/70  Signal level=-98 dBm  
>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>           Tx excessive retries:0  Invalid misc:40   Missed beacon:0
> 
> I start seeing lots of Invalid misc errors and connection drops. If I reboot, 
> then signal will be back to normal for a period of time again.
> 
> My official kernel is from Fedora rawhide (2.6.38-0.rc3.git4.1.fc15.x86_64)
> 
> Anyone else notice poor link/signal levels?
> 
> .37 showed no such issues.
> 
> 
> -- snip -- 
> 
> kernel messages when this occurred:
> 
> 
> [15110.285207] CE: hpet increased min_delta_ns to 20113 nsec
> [33809.732205] cfg80211: Calling CRDA to update world regulatory domain
> [33809.831816] cfg80211: World regulatory domain updated:
> [33809.831819] cfg80211:     (start_freq - end_freq @ bandwidth), 
> (max_antenna_gain, max_eirp)
> [33809.831822] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [33809.831825] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 
> mBi, 2000 mBm)
> [33809.831827] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 
> mBi, 2000 mBm)
> [33809.831830] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [33809.831832] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [33809.831841] cfg80211: Calling CRDA for country: US
> [33809.835215] cfg80211: Regulatory domain changed to country: US
> [33809.835217] cfg80211:     (start_freq - end_freq @ bandwidth), 
> (max_antenna_gain, max_eirp)
> [33809.835220] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 
> mBi, 2700 mBm)
> [33809.835223] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 
> mBi, 1700 mBm)
> [33809.835225] cfg80211:     (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [33809.835228] cfg80211:     (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [33809.835230] cfg80211:     (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [33809.835233] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 
> mBi, 3000 mBm)
> [33812.364119] wlan0: authenticate with aa:bb:cc:dd:ee:ff (try 1)
> [33812.366620] wlan0: authenticated
> [33812.366643] wlan0: waiting for beacon from aa:bb:cc:dd:ee:ff
> [33828.410709] wlan0: authenticate with aa:bb:cc:dd:ee:ff (try 1)
> [33828.413725] wlan0: authenticated
> [33828.413748] wlan0: waiting for beacon from aa:bb:cc:dd:ee:ff
> [33828.418428] wlan0: beacon received
> [33828.421042] wlan0: associate with aa:bb:cc:dd:ee:ff (try 1)
> [33828.446039] wlan0: RX AssocResp from aa:bb:cc:dd:ee:ff (capab=0x411 
> status=0 aid=1)
> [33828.446042] wlan0: associated
> [34100.737227] cfg80211: Calling CRDA to update world regulatory domain
> [34100.740353] cfg80211: World regulatory domain updated:
> [34100.740355] cfg80211:     (start_freq - end_freq @ bandwidth), 
> (max_antenna_gain, max_eirp)
> [34100.740358] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34100.740361] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 
> mBi, 2000 mBm)
> [34100.740363] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 
> mBi, 2000 mBm)
> [34100.740366] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34100.740368] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34100.740378] cfg80211: Calling CRDA for country: US
> [34100.742781] cfg80211: Regulatory domain changed to country: US
> [34100.742784] cfg80211:     (start_freq - end_freq @ bandwidth), 
> (max_antenna_gain, max_eirp)
> [34100.742787] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 
> mBi, 2700 mBm)
> [34100.742789] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 
> mBi, 1700 mBm)
> [34100.742792] cfg80211:     (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34100.742794] cfg80211:     (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34100.742797] cfg80211:     (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34100.742799] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 
> mBi, 3000 mBm)
> [34103.381063] wlan0: authenticate with aa:bb:cc:dd:ee:ff (try 1)
> [34103.385675] wlan0: authenticated
> [34103.385707] wlan0: waiting for beacon from aa:bb:cc:dd:ee:ff
> [34103.465542] wlan0: beacon received
> [34103.468042] wlan0: associate with aa:bb:cc:dd:ee:ff (try 1)
> [34103.470316] wlan0: RX AssocResp from aa:bb:cc:dd:ee:ff (capab=0x411 
> status=0 aid=1)
> [34103.470319] wlan0: associated
> [34114.737244] cfg80211: Calling CRDA to update world regulatory domain
> [34114.739837] cfg80211: World regulatory domain updated:
> [34114.739840] cfg80211:     (start_freq - end_freq @ bandwidth), 
> (max_antenna_gain, max_eirp)
> [34114.739843] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34114.739846] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 
> mBi, 2000 mBm)
> [34114.739848] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 
> mBi, 2000 mBm)
> [34114.739851] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34114.739853] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34114.739863] cfg80211: Calling CRDA for country: US
> [34114.742475] cfg80211: Regulatory domain changed to country: US
> [34114.742477] cfg80211:     (start_freq - end_freq @ bandwidth), 
> (max_antenna_gain, max_eirp)
> [34114.742480] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 
> mBi, 2700 mBm)
> [34114.742483] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 
> mBi, 1700 mBm)
> [34114.742485] cfg80211:     (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34114.742488] cfg80211:     (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34114.742490] cfg80211:     (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34114.742493] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 
> mBi, 3000 mBm)
> [34124.964949] wlan0: authenticate with aa:bb:cc:dd:ee:ff (try 1)
> [34124.967818] wlan0: authenticated
> [34124.967842] wlan0: waiting for beacon from aa:bb:cc:dd:ee:ff
> [34124.969754] wlan0: beacon received
> [34124.972015] wlan0: associate with aa:bb:cc:dd:ee:ff (try 1)
> [34124.974327] wlan0: RX AssocResp from aa:bb:cc:dd:ee:ff (capab=0x411 
> status=0 aid=1)
> [34124.974329] wlan0: associated
> [34249.738240] cfg80211: Calling CRDA to update world regulatory domain
> [34249.740811] cfg80211: World regulatory domain updated:
> [34249.740814] cfg80211:     (start_freq - end_freq @ bandwidth), 
> (max_antenna_gain, max_eirp)
> [34249.740817] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34249.740819] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 
> mBi, 2000 mBm)
> [34249.740822] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 
> mBi, 2000 mBm)
> [34249.740824] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34249.740827] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34249.740835] cfg80211: Calling CRDA for country: US
> [34249.743295] cfg80211: Regulatory domain changed to country: US
> [34249.743298] cfg80211:     (start_freq - end_freq @ bandwidth), 
> (max_antenna_gain, max_eirp)
> [34249.743300] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 
> mBi, 2700 mBm)
> [34249.743303] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 
> mBi, 1700 mBm)
> [34249.743305] cfg80211:     (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34249.743308] cfg80211:     (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34249.743310] cfg80211:     (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 
> mBi, 2000 mBm)
> [34249.743313] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 
> mBi, 3000 mBm)
> [34252.430829] wlan0: authenticate with aa:bb:cc:dd:ee:ff (try 1)
> [34252.433740] wlan0: authenticated
> [34252.433765] wlan0: waiting for beacon from aa:bb:cc:dd:ee:ff
> [34275.365426] wlan0: authenticate with aa:bb:cc:dd:ee:ff (try 1)
> [34275.367527] wlan0: authenticated
> [34275.367552] wlan0: waiting for beacon from aa:bb:cc:dd:ee:ff
> [35121.713088] wlan0: authenticate with aa:bb:cc:dd:ee:ff (try 1)
> [35121.716042] wlan0: authenticated
> [35121.716079] wlan0: waiting for beacon from aa:bb:cc:dd:ee:ff
> [35121.743282] wlan0: beacon received
> [35121.746047] wlan0: associate with aa:bb:cc:dd:ee:ff (try 1)
> [35121.750694] wlan0: RX AssocResp from aa:bb:cc:dd:ee:ff (capab=0x411 
> status=0 aid=2)
> [35121.750697] wlan0: associated
> 
> Thanks, 
> Shawn.

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