Date: Mon, 3 Oct 2011 22:03:33 -0700 From: Roman Bogorodskiy <novel@FreeBSD.org> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-wireless@freebsd.org Subject: Re: bwn + BETA3/ppc = very unstable Message-ID: <20111004050331.GA2276@reemsky> In-Reply-To: <CAJ-VmonYRHHbU-z219TjqnOxLppWhyjpTNw09Z_qzbuPCGmzCA@mail.gmail.com> References: <20111002232848.GA1943@reemsky> <CAJ-Vmo=DidydmY3Lr-WhMnNfPRODnO0C4rd=%2B2XcdeUDUe4WoA@mail.gmail.com> <20111003024406.GC1943@reemsky> <20111003044350.GD1943@reemsky> <CAJ-VmonYRHHbU-z219TjqnOxLppWhyjpTNw09Z_qzbuPCGmzCA@mail.gmail.com>
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--BXVAT5kNtrzKuDFl Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Adrian Chadd wrote: > On 3 October 2011 12:43, Roman Bogorodskiy <novel@freebsd.org> wrote: > > =A0Roman Bogorodskiy wrote: >=20 > > 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. >=20 > It sounds like a calibration issue. >=20 > > Now uptime is 1 hour and loss rate is about 80-85%. > > > > Any directions how can I debug this? >=20 > 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. >=20 > Debugging this - I'd first isolate it to whether it is: >=20 > * TX issues; > * RX issues; > * or both TX and RX issues. >=20 > 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. Experimented with iperf today. The setup is the following: laptop A: G4 with bwi laptop B: i386 with ath Both connected to the same ssid. Started iperf on B in a server mode and connected from g4 -- nothing is displayed on the server side. Started iperf on A in a server mode and connected from B, got that: [ 3] Server Report: [ 3] 0.0-10.0 sec 1.15 MBytes 967 Kbits/sec 2.224 ms 71/ 893 (8%) 8% packets loss is probably not that bad. So it looks like the problem is mostly with outgoing traffic. > 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. >=20 > The BWI_DBG bits are defined in if_bwivar.h. Done, here's the output of `dmesg|grep bwi0`: http://people.freebsd.org/~novel/misc/bwi_debug.txt (22K) Does it say something to you? Roman Bogorodskiy --BXVAT5kNtrzKuDFl Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (FreeBSD) iQEcBAEBAgAGBQJOipOjAAoJEMltX/4IwiJqQ3wH/2RqWZtS7pWVVDn0Wbv9QuBS HNmoYrQN6FJLOncB54r0G+8qs1WrVzlG3Z2jjWBBlGrKzMm6+Zf7pFIZBp5+AdI1 QbplhzjBLPTht7oB1moUw0KG5/oW9jD/mULKTlY7rVqe/UckSvdWkR4LL80EDcfB dn7BSB1Tni4XDq8tAfck8TchjBTBs43VX7cRtv3HIuIT3r2L0Qro/L1+4bAy1dL/ bPjTuig4eZECDMt3pnmSjczx433yzo+LjitVhpDxU+zLvY5aCyK9hwbaXmGk+YSq EdM6hiQYvMe4F/fD4maaT645BB00aeFHhR7hpXgqOYazJy7xpmH6pq25sLd96S0= =qzSq -----END PGP SIGNATURE----- --BXVAT5kNtrzKuDFl--
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