Date: Sat, 9 Nov 2013 22:20:14 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Brandon Gooch <jamesbrandongooch@gmail.com> Cc: "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: iwn(4) hangs after r257133 Message-ID: <CAJ-VmomYqL8BKQLnrax8Nt-zTBHgSwSYi02=B=gU%2B=FPGuiUmg@mail.gmail.com> In-Reply-To: <CAJ-Vmo=ZFQtQbq1TQ5v5kKGjKSK70fmM0pxw5tsKJgrSFVW_pg@mail.gmail.com> References: <CALBk6yJf%2BZ_%2BF8kVPFOdQ%2B8UC3vBU3MZJGjkPfxeSkjSZ6FPbA@mail.gmail.com> <CAJ-Vmo=EeoxUzbiSU=TB2CoSrF_D0LiGv3TaBZXzPk2ZDAVPtg@mail.gmail.com> <CALBk6yLk-KSkTFebx=u6v4jpTxG_5ND645=ohzgKGXSHUsojbQ@mail.gmail.com> <CAJ-Vmo=ZFQtQbq1TQ5v5kKGjKSK70fmM0pxw5tsKJgrSFVW_pg@mail.gmail.com>
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Oh, and you need to print out the tx->rate field using "0x%04x", rather than %d. The completion value is in hex. -adrian On 9 November 2013 22:18, Adrian Chadd <adrian@freebsd.org> wrote: > Sure, flip on 'wlandebug +rate' (assuming you compiled with IEEE80211_DEBUG) > > > -a > > On 9 November 2013 21:08, Brandon Gooch <jamesbrandongooch@gmail.com> wrote: >> On Sat, Nov 9, 2013 at 8:46 PM, Adrian Chadd <adrian@freebsd.org> wrote: >>> Hi! >>> >>> On 9 November 2013 18:29, Brandon Gooch <jamesbrandongooch@gmail.com> wrote: >>>> Turns out that not enabling MRR causes my Intel Ultimate N WiFi Link >>>> 5300 to hang after only a few moments of use. >>> >>> That's .. odd. Ok. >>> >>>> For now, I've just reverted only those aspects of r257133, enabling >>>> MRR and keeping the rate index lookup, which seems to do something on >>>> my hardware at least (I assume it's not the right thing based on >>>> Adrian's analysis, but it works never-the-less). >>>> >>>> Has anyone else hit this with Intel WiFi hardware? >>>> >>>> Also, what needs to be done to have MRR working properly? >>> >>> So, it could be a fall out of how utterly crap AMRR is at 11n rates. >>> >>> Please compile with IWN_DEBUG, then do this before you associate: >>> >>> sysctl dev.iwn.0.debug=0x1 >>> >>> (that's IWN_DEBUG_XMIT in sys/dev/iwn/if_iwn_debug.h) >>> >>> You can do the same on a kernel with and without the MRR stuff enabled. >>> >>> I'd like to see what the actual rate selection looks like and what the >>> final rate selection is. We may have to patch the kernel to print out >>> the contents of 'rate' and 'tx->rate' in iwn_tx_data() to get that. >> >> I've attached the log output, both with and without MRR. >> >> The output looks very much the same within iwn_tx_data(); in >> iwn5000_tx_done() things are >> clearly different. >> >> If I'm reading the rate conversion bits correctly, I see anywhere from >> 6 Mbps to 60 Mbps, with the >> the non-MRR module "getting stuck" -- I really don't know what has >> happened when it does this. >> >> Is there any further debugging output that would be helpful? >> >> -Brandon >> >>> The MRR stuff is a bit special. I don't know how the link table works >>> in great depth yet. I know it's broken for 11n; it's plainly using the >>> wrong indexes now. That's why I disabled it. It shouldn't take that >>> much work to get it in the tree again; it'll just be fiddly. The easy >>> bit is populating the table. The hard bit is knowing which index to >>> set linkq to when transmitting a frame. >>> >>> >>> >>> -adrian
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