Date: Fri, 27 Feb 2009 12:55:32 +0900 From: Weongyo Jeong <weongyo.jeong@gmail.com> To: Bengt Ahlgren <bengta@sics.se> Cc: Nathan Butcher <n-butcher@fusiongol.com>, Sam Leffler <sam@freebsd.org>, freebsd-stable@freebsd.org Subject: Re: ural driver stalls under FreeBSD7.1 Message-ID: <20090227035532.GC72273@weongyo.cdnetworks.kr> In-Reply-To: <49A74A21.1050109@freebsd.org> References: <49A61894.5040804@fusiongol.com> <20090226045340.GC70144@weongyo.cdnetworks.kr> <uh7hc2h13a7.fsf@P142.sics.se> <49A74A21.1050109@freebsd.org>
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On Thu, Feb 26, 2009 at 06:04:17PM -0800, Sam Leffler wrote: > 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). I agree with sam because I saw some cases like stalls during background scanning that most of them I think it's caused by H/W miss-operation or miss-configuration by mistakes of driver. regards, Weongyo Jeong
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