linux-kernel - Re: 3.1.0-rc9+ : wlan stops working w/o any error messages

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Date:	Mon, 17 Oct 2011 12:30:47 -0700
From:	wwguy <wey-yi.w.guy@...el.com>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	David Rientjes <rientjes@...gle.com>, werner <w.landgraf@...ru>,
	"ilw@...ux.intel.com" <ilw@...ux.intel.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 3.1.0-rc9+ : wlan stops working w/o any error messages

On Mon, 2011-10-17 at 00:52 -0700, Toralf Förster wrote:
> Toralf Förster wrote at 09:31:58
> > > What does "iwconfig" show?
> 
> And this is the state if the netwerk stops working :
> 
> wlan0     IEEE 802.11abgn  ESSID:"IBM"  
>           Mode:Managed  Frequency:2.462 GHz  Access Point: 00:21:55:AC:8B:80   
>           Bit Rate=54 Mb/s   Tx-Power=15 dBm   
>           Retry  long limit:7   RTS thr:off   Fragment thr:off
>           Encryption key:off
>           Power Management:off
>           Link Quality=45/70  Signal level=-65 dBm  
>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>           Tx excessive retries:0  Invalid misc:77   Missed beacon:0
> 
> 
When the problem happen, could you please dump the tx_queue status in
debugfs and send us the information

In order to dump the the tx_queue, please do the following
1. make sure you compile your kernel with CONFIG_IWLWIFI_DEBUGFS=y
2. unload and reload the "iwlagn" module
3. cd to /sys/kernel/debug/ieee80211/phyX/iwlwifi/debug (phX: "X" based
on your system)
4. "$sudo cat tx_queue" to show the current tx queue status

Thanks
Wey



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