Date: Mon, 3 Oct 2011 12:54:30 +0800 From: Adrian Chadd <adrian@freebsd.org> To: Roman Bogorodskiy <novel@freebsd.org> Cc: freebsd-wireless@freebsd.org Subject: Re: bwn + BETA3/ppc = very unstable Message-ID: <CAJ-VmonYRHHbU-z219TjqnOxLppWhyjpTNw09Z_qzbuPCGmzCA@mail.gmail.com> In-Reply-To: <20111003044350.GD1943@reemsky> References: <20111002232848.GA1943@reemsky> <CAJ-Vmo=DidydmY3Lr-WhMnNfPRODnO0C4rd=%2B2XcdeUDUe4WoA@mail.gmail.com> <20111003024406.GC1943@reemsky> <20111003044350.GD1943@reemsky>
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On 3 October 2011 12:43, Roman Bogorodskiy <novel@freebsd.org> wrote: > =A0Roman Bogorodskiy wrote: > Hm, I have applied a fix similar to this one: > > http://www.openbsd.org/cgi-bin/cvsweb/src/sys/dev/ic/bwi.c.diff?r1=3D1.88= ;r2=3D1.89 > > I'm not sure if it's a coincidence or not, but I had no panics since > then. Packet loss rate are still very high - first packets go through > without losses, but eventually loss rate goes up. It sounds like a calibration issue. > Now uptime is 1 hour and loss rate is about 80-85%. > > Any directions how can I debug this? Well, firstly, can you please do up a patch against -HEAD? I'll commit it to FreeBSD-HEAD ASAP and then include it in the list of things I want to backmerge into -9. Debugging this - I'd first isolate it to whether it is: * TX issues; * RX issues; * or both TX and RX issues. I suggest liberal use of iperf in UDP mode to TX things. It's a bit difficult as TX'ing a one way UDP stream also involves RX'ing an ACK from the remote end, so it isn't a 100% guaranteed way of debugging it. But it hopefully will show it's either TX or RX related. I'd also enable BWI_DEBUG and then flip on the relevant bits that let you debug the attach and configuration bits (BWI_DBG_RF, BWI_DBG_TXPOWER, BWI_DBG_ATTACH). In fact, enable both BWI_DEBUG and BWI_DEBUG_VERBOSE in your kernel config and rebuild. The BWI_DBG bits are defined in if_bwivar.h. Adrian
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