linux-kernel - Re: iwlagn is getting very shaky

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Date:	Thu, 3 Nov 2011 20:56:40 -0400
From:	Richard Yao <ryao@...stonybrook.edu>
To:	"Guy, Wey-Yi" <wey-yi.w.guy@...el.com>
Cc:	Norbert Preining <preining@...ic.at>,
	David Rientjes <rientjes@...gle.com>,
	"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>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: iwlagn is getting very shaky

Dear Wey,

My situation is very similar to Norbert's. At my house, I have no
issues at all, but at my university, I tend to have issues. In the
past, using 11n_disable=1 would cause the wireless interface to break
until I executed "modprobe -r iwlagn && modprobe iwlagn" as root. That
was around Linux 3.0-rc4. I haven't tried it since, but what seems to
help is "iwconfig wlan0 rts 0", but even that is not perfect. I just
gave "modprobe -r iwlagn && modprobe iwlagn 11n_disable=1" another try
and it makes no difference.

Issues with the campus Wi-Fi are not isolated to Linux users. I
suspect it has something to do with the 100 or so access points that I
see when I do "iwlist wlan0 scan" at my university and the 4 that I
see when I do that off campus. I don't want to imagine how many
devices are trying to use the available bandwidth. I imagine that
implementing "auto" for rts would improve both my and Norbert's
situations.

Yours truly,
Richard Yao

On Tue, Nov 1, 2011 at 11:21 PM, Guy, Wey-Yi <wey-yi.w.guy@...el.com> wrote:
> Hi Norbert,
>
> On Tue, 2011-11-01 at 20:13 -0700, Norbert Preining wrote:
>> Hi all,
>>
>> On Mi, 26 Okt 2011, Norbert Preining wrote:
>> > On Di, 25 Okt 2011, wwguy wrote:
>> > > so this is different problem, right? it looks different compare to what
>> > > you described before which is cause by queue stopped.
>> >
>> > I assume that this is a different regression concerning 3.1.0 released.
>>
>> Is there any progress on that? Currently linux git status is unusable
>> with respect to iwlwifi?
>>
>> Are there any changes planned before rc1?
>>
> after the firmware reloaded, is the traffic resume? or it is continuous
> without traffic?
>
> Looks like the different "queue stuck" problem you are seeing. you
> mention you only seeing this at university but not home. So what the
> differences are?
> what Band/channel you are using, also, if you disable 11n, are you still
> seeing the problem?
>
> you also mention it is might related to suspend/resume, could you please
> give a better description why you think it might be related
>
> Thanks
> Wey
>
>
>
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