Date: Tue, 17 Feb 2009 12:30:51 -0800 From: Sam Leffler <sam@freebsd.org> To: Bengt Ahlgren <bengta@sics.se> Cc: freebsd-mobile@freebsd.org Subject: Re: Problems with ath at kern.hz=100 Message-ID: <499B1E7B.2030908@freebsd.org> In-Reply-To: <uh7y6w4zwsq.fsf@P142.sics.se> References: <uh7iqnjzzi9.fsf@P142.sics.se> <20090210154047.N38905@sola.nimnet.asn.au> <4991ABA0.4050300@freebsd.org> <uh7fximfatw.fsf@P142.sics.se> <4991DB1F.7060809@freebsd.org> <uh7y6w4zwsq.fsf@P142.sics.se>
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Bengt Ahlgren wrote: > Sam Leffler <sam@freebsd.org> writes: > > [...] > > >> You've removed all the context of the original problem; I can't recall >> what you were trying to fix. The ps q drops might be caused by a bug >> that was fixed (I think in RELENG_7). I don't see what version of >> code you're running so can't tell. >> > > Sorry, a summary of the problem: > > The system frequently comes into a state where outgoing packets are > held somewhere. The condition persists for seconds to minutes. It > goes away by itself, but some of the packets are usually lost. This > occurs on ath, FreeBSD 7.1-REL, no SMP, with kern.hz=100 (but not with > hz=1000). Original mail with description can be found here: > > http://lists.freebsd.org/pipermail/freebsd-mobile/2009-February/011343.html > > I have done some more investigation, inserting debug prints in > ath_start (if_ath.c 1.177.2.2.2.1), one just after IFQ_DRV_DEQUEUE > (line 1576), another just before the call to ieee80211_pwrsave (line > 1614). > > Packets are dequeued, but ieee80211_pwrsave is called and nothing > happens. Below is the output from "athdebug xmit" with these extra > two DPRINTF:s during the queue-up. Then after a while packets are > sent again. > > Bengt > > <...debug output removed...> Did you try RELENG_7? ap mode power save was fixed post 7.1 release. Sam
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