linux-kernel - Re: iwlagn is getting very shaky

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Date:	Tue, 18 Oct 2011 22:55:10 -0700
From:	"Guy, Wey-Yi" <wey-yi.w.guy@...el.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	David Rientjes <rientjes@...gle.com>,
	Norbert Preining <preining@...ic.at>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ipw3945-devel@...ts.sourceforge.net" 
	<ipw3945-devel@...ts.sourceforge.net>,
	"ilw@...ux.intel.com" <ilw@...ux.intel.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
Subject: Re: iwlagn is getting very shaky

hi,

On Tue, 2011-10-18 at 23:11 -0700, Pekka Enberg wrote:
> On Wed, Oct 19, 2011 at 9:09 AM, David Rientjes <rientjes@...gle.com> wrote:
> > On Wed, 19 Oct 2011, Norbert Preining wrote:
> >
> >> Hi everyone
> >>
> >> (please Cc),
> >>
> >> I am currently running 3.1.0-rc10, and I am having a hard time with
> >> the wlan network here at the university.
> >>
> >> For quite some time, like 10min, it is fine, then suddently the
> >> iwlagn driver gives up on me and connection is dropped.
> >>
> >> In the log file I see:
> >> [  172.137011] iwlagn 0000:06:00.0: Tx aggregation enabled on ra = 00:24:c4:ab:bd:ef tid = 0
> >> [  821.841016] iwlagn 0000:06:00.0: Tx aggregation enabled on ra = 00:24:c4:ab:bd:ef tid = 6
> >> [ 1095.580735] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 1/3)
> >> [ 1095.780076] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 2/3)
> >> [ 1095.980101] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 3/3)
> >> [ 1096.180117] wlan0: direct probe to 00:24:c4:ab:bd:e0 timed out
> >> [ 1105.255464] wlan0: deauthenticating from 00:24:c4:ab:bd:ef by local choice (reason=2)
> >> [ 1105.255519] iwlagn 0000:06:00.0: Stopping AGG while state not ON or starting
> >> [ 1105.265581] cfg80211: Calling CRDA for country: JP
> >> [ 1105.271476] wlan0: authenticate with 00:24:c4:ab:bd:e0 (try 1)
> >> [ 1105.468105] wlan0: authenticate with 00:24:c4:ab:bd:e0 (try 2)
> >> [ 1105.668110] wlan0: authenticate with 00:24:c4:ab:bd:e0 (try 3)
> >> [ 1105.868090] wlan0: authentication with 00:24:c4:ab:bd:e0 timed out
> >> [ 1113.667890] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 1/3)
> >> [ 1113.864116] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 2/3)
> >> [ 1114.064095] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 3/3)
> >> [ 1114.264109] wlan0: direct probe to 00:24:c4:ab:bd:e0 timed out
> >>
> >> Somewhere around 1100 the connection is gone and never comes back again.
> >>
> >> I tried removing the driver module from the kernel and reinserting it,
> >> tried to turn on and off the hardware swithc (rfkill), all without
> >> no success, the wlan connection remains dead until I reboot.
> >>
> >> I am not sure exactely when it started, I guess somewhere in the
> >> 3.1 cycle, before I was permanently working wiht wlan, now I always
> >> plug in the cable.
> >>
> >> If there is any way to track down this, or any suggestions how I can
> >> debug it, please let me know.
> >>
> >> Hardware: Sony VGN-Z11, Intel(R) WiFi Link 5100 AGN, REV=0x54
> >> L1 Enabled; Disabling L0S
> >> device EEPROM VER=0x11e, CALIB=0x4
> >> Device SKU: 0Xf0
> >> Tunable channels: 13 802.11bg, 24 802.11a channels
> >> loaded firmware version 8.83.5.1 build 33692 (EXP)
> >>

looks like you are using experimental version of uCode, but by saying
that, I don't think i will make much differences

so could you dump the tx queue to see if it is the similar problem what
Norbert point out

thanks
Wey

> >>
> >> On the other hand, the same laptop with the very same configuration
> >> works very nicely in my flat's wlan, which is some dirt cheap Japanese
> >> only wlan router.
> >>
> >
> > There have been recent issues in 3.1-rc9 reported with iwlagn, see the
> > thread at https://lkml.org/lkml/2011/10/15/107 even though you have
> > different hardware.  Adding Wey-Yi Guy from Intel and the linux-wireless
> > mailing list to the cc.
> 
> I'm seeing very similar problems with 3.1-rc9 when my laptop is
> connected to an iPhone WiFi hotspot. Works just fine at home where I
> use Airport Express.
> 
>                         Pekka


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