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Subject: Re: Increasing the DMESG buffer....
From: Ian Lepore <freebsd@damnhippie.dyndns.org>
To: Willem Jan Withagen <wjw@digiware.nl>
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Date: Wed, 21 Nov 2012 09:01:32 -0700
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Cc: "stable@freebsd.org" <stable@freebsd.org>,
 Peter Jeremy <peter@rulingia.com>, Andriy Gapon <avg@freebsd.org>
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On Wed, 2012-11-21 at 16:51 +0100, Willem Jan Withagen wrote:
> On 2012-11-21 16:08, Andriy Gapon wrote:
> > on 21/11/2012 15:20 Willem Jan Withagen said the following:
> >> On 2012-11-21 11:14, Peter Jeremy wrote:
> >>> On 2012-Nov-21 10:57:49 +0100, Willem Jan Withagen <wjw@digiware.nl> wrote:
> >>>> Probably because the kernelbuffer for it is too small.
> >>>> I know there used to be a kernel option to increase it.
> >>>> But I can not find it with the setting in NOTES or any other place I
> >>>> looked....
> >>>
> >>> # Size of the kernel message buffer.  Should be N * pagesize.
> >>> options         MSGBUF_SIZE=40960
> >>>
> >>
> >> Right,
> >>
> >> That was the one....
> > 
> > 
> > Alternatively you could set kern.msgbufsize tunable.
> 
> That is a fresh new one for me.
> Now you tell me.... :) after I've started compiling a new kernel.
> 
> Need to set that in loader.conf.
> 
> Thanx,
> --WjW

You know what would be great?  Have this value auto-tune itself upwards
if bootverbose is true.  The sound drivers now spit out so much stuff
with bootverbose true that you need like a 128k buffer to see the early
boot messages.

-- Ian