Increasing the DMESG buffer....

perryh at perryh at
Sun Nov 25 07:13:14 UTC 2012

Alexander Motin <mav at> wrote:

> On 25.11.2012 01:43, Adrian Chadd wrote:
> > I'm surprised it's not tunable via a kenv variable at boottime..
> It is tunable. AFAIR that is it:
> kern.msgbufsize="65536"	# Set size of kernel message buffer

Yep.  That tunable is available in 8.2 (not 8.1), and I think in
all 9.x; dunno if it was ever MFC'd to the 7.x branch.

I was going to suggest adding a mention in the docs where verbose
boot is described, but the only verbose boot mention I found is
in Handbook 13.4.1, "Kernel Boot Flags", which doesn't seem like
a particularly good place to get into tunables.

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