Date: Thu, 26 Feb 2009 18:04:17 -0800 From: Sam Leffler <sam@freebsd.org> To: Bengt Ahlgren <bengta@sics.se> Cc: Nathan Butcher <n-butcher@fusiongol.com>, freebsd-stable@freebsd.org, Weongyo Jeong <weongyo@freebsd.org> Subject: Re: ural driver stalls under FreeBSD7.1 Message-ID: <49A74A21.1050109@freebsd.org> In-Reply-To: <uh7hc2h13a7.fsf@P142.sics.se> References: <49A61894.5040804@fusiongol.com> <20090226045340.GC70144@weongyo.cdnetworks.kr> <uh7hc2h13a7.fsf@P142.sics.se>
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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
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