Date: Sun, 25 Nov 2012 17:20:52 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Lars Engels <lars.engels@0x20.net> Cc: freebsd-stable@freebsd.org Subject: Re: Increasing the DMESG buffer.... Message-ID: <20121125165737.V21191@sola.nimnet.asn.au> In-Reply-To: <1ab82c79bc6d72fdaa90e7ed0c794f5f@mail.0x20.net> References: <50AD0E82.3070706@digiware.nl> <20121121194142.8c4bf7d1977f13801a021ccc@getmail.no> <op.wn4141f88527sy@212-182-167-131.ip.telfort.nl> <CAJ-VmomREO6uj_izmD%2Bp90cFn=AQcz7UbZNkX8PVnU5mG_8ufQ@mail.gmail.com> <20121122144400.M21191@sola.nimnet.asn.au> <CAJ-Vmonk2RS=FwpgVHpeuFF5jf%2BSjE2Hv8kOFBrDCkv-=hTYSg@mail.gmail.com> <20121122213328.J21191@sola.nimnet.asn.au> <50AE36FF.7080106@FreeBSD.org> <CAJ-Vmo=UOTu0KG6yHjZ_gBB4HGSGNJOAhn3HT-8gNsh_=ih7Yg@mail.gmail.com> <CAN6yY1v1AdhgqQfONbDAEueU2wnFZDO8GvegRzq10y0yoj8kDg@mail.gmail.com> <20121122224906.GE88593@in-addr.com> <CAN6yY1sK3U=18ovFYPAViuMxTDCm2qZ-msLmM7Zgymx=u6ga4w@mail.gmail.com> <20121123150719.M21191@sola.nimnet.asn.au> <1ab82c79bc6d72fdaa90e7ed0c794f5f@mail.0x20.net>
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On Fri, 23 Nov 2012 11:33:21 +0100, Lars Engels wrote: > Am 23.11.2012 05:50, schrieb Ian Smith: > > On Thu, 22 Nov 2012 16:20:52 -0800, Kevin Oberman wrote: [..] > > > >> Also, isn't the entire verbose boot captured in /var/run/dmesg? > > > > > > > > Only if the message buffer hasn't overflowed before the utility runs > > to > > > > populate the file > > > > > > Ouch! I did miss hte obvious. Thanks for pointing this out. > > > > I've noticed quite a few truncated verbose dmesgs posted over the last > > couple of years, sometimes frustratingly starting after important stuff > > like the CPU info or ACPI tables etc .. Lars presumably had increased > > his buffer size to capture 85k, which would be well less than Adrian's > > suggested 64k with more minimal hda + pcm logging. Perhaps a debug.snd. > > or something tunable could reenable the higher verbosity if/when needed? > > > No, I was creating the dmesg on a vanilla FreeBSD 10-CURRENT kernel and the > other one on PC-BSD 9.1-RCsomething. Well that's interesting, excuse my assumption. But as downloaded: -rw-r--r-- 1 smithi smithi 82415 Nov 22 14:08 T61_dmesg.boot.10.works So is the default msgbufsize on 10 different to what mav@ just posted? > kern.msgbufsize="65536" # Set size of kernel message buffer And if the PC-BSD 9.1-RCsomething one you refer to is: http://bsd-geek.de/FreeBSD/T61_dmesg.boot.9.works then that's only 37844 bytes and has most of its head missing, in fact starting only a screenful before the hda stuff that's most of the rest. cheers, Ian
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