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Date: Thu, 26 Feb 2009 18:04:17 -0800
From: Sam Leffler <sam@freebsd.org>
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To: Bengt Ahlgren <bengta@sics.se>
References: <49A61894.5040804@fusiongol.com>	<20090226045340.GC70144@weongyo.cdnetworks.kr>
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Cc: Nathan Butcher <n-butcher@fusiongol.com>, freebsd-stable@freebsd.org,
	Weongyo Jeong <weongyo@freebsd.org>
Subject: Re: ural driver stalls under FreeBSD7.1
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Bengt Ahlgren wrote:
> Weongyo Jeong <weongyo.jeong@gmail.com> writes:
>
>   
>> On Thu, Feb 26, 2009 at 01:20:36PM +0900, Nathan Butcher wrote:
>>     
>>> I have a Buffalo WLI-U2-KG54-AI wireless USB adaptor.
>>> It has been malfunctioning for quite a while under FreeBSD7.0 and 7.1
>>>
>>> Typically, It works for a while until eventually it stalls data
>>> transfers completely. It always seems to do this after an unspecified
>>> amount of time.
>>>
>>> I know the hardware isn't at fault because the device works fine under
>>> Linux.
>>>       
>> Could you please check that `ifconfig <ifname> -bgscan' disabling the
>> background scan helps your symptom?
>>     
>
> The above sounds like the same problem as this:
>
> http://lists.freebsd.org/pipermail/freebsd-mobile/2009-February/011376.html
> http://lists.freebsd.org/pipermail/freebsd-mobile/2009-February/011343.html
>
> The problem is in the background scanning logic in sys/net80211.
>
>   

I don't see how you come to this conclusion.  ural is a totally 
different driver than ath and so far as I can recall you never found the 
cause for your problem w/ ath.  Most of the usb wireless drivers do a 
haphazard job of synchronizing async tasks like bg scan with the 
foreground tx/rx processing.  This can lead to firmware and/or usb 
issues.  ath does not have these issues but I am aware of at least one 
problem w/ bg scanning in ath under RELENG_7 (that is not present in HEAD).

    Sam