Date: Sun, 30 Mar 2014 09:21:18 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: Chris H <bsd-lists@bsdforge.com> Cc: Adam McDougall <mcdouga9@egr.msu.edu>, freebsd-stable@freebsd.org Subject: Re: where's the full copy of dmesg(8)? Message-ID: <20140330162118.GN60889@funkthat.com> In-Reply-To: <9da21869740371e51b0e684f493676ef.authenticated@ultimatedns.net> References: <d3e160a01d1af1af67980b151cc57da3.authenticated@ultimatedns.net> <53378975.1000905@egr.msu.edu> <9da21869740371e51b0e684f493676ef.authenticated@ultimatedns.net>
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Chris H wrote this message on Sun, Mar 30, 2014 at 01:28 -0700:
> Greetings, Adam, and thank you for your reply.
> > On 03/29/2014 21:37, Chris H wrote:
> >> Greetings,
> >> I'm testing on 9.2-STABLE, and was experimenting on an AMD sempron
> >> (140). Booting from the boot-only, or DVD-1 DVD's doesn't emit the
> >> entire dmesg(8) output. Building, and installing a custom kernel also
> >> didn't provide the full dmesg(8) output.
> >> Specifically; it omits the top N lines (N = as yet, undetermined Number).
> >> I have no idea why, or how to correct this. I'm pretty confident
> >> the processor, and motherboard (MSI) are not too new for FreeBSD.
> >
> > I am almost certain you want to increase kern.msgbufsize at the boot
> > loader before booting.
> >
> > % sysctl -d kern.msgbufsize
> > kern.msgbufsize: Size of the kernel message buffer
>
> Interesting. Given that every system I run has (default) value of 65536.
> Can you, or anyone suggest what the correct, of better value should be?
> Or better, what the formula to determine that value is? I'm not finding
> either of those answers in the man(1) pages, or the documentation.
>
> Thanks again, for your thoughtful reply.
Well, you're booting w/ bootverbose set, which is why you're running
out of dmesg space... choosing a default that doesn't waste memory is
hard, because some systems have complicated PCI bus layouts and many
devices, that you'd have to set it very large to be fine for all
systems, and that would be a waste on 99% of them...
If you do find a system where a normal (non-bootverbose) boot cannot
fit in dmesg, let us know...
Thanks.
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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