dmesg : no output on 1 of 2 7-stable boxes
Oliver Fromme
olli at lurza.secnetix.de
Wed Feb 20 17:56:35 UTC 2008
Julian H. Stacey wrote:
> Oliver Fromme wrote:
> > The dmesg buffer is a circular buffer containing both
> > kernel output and console output. However, "dmesg"
> > displays only the kernel output. If there was lots of
> > console output, it filled all of the dmesg buffer,
> > so "dmesg" displays nothing (all of the kernel output
> > was overwritten by console output). "dmesg -a" will
> > display everything, i.e. kernel + console output.
>
> Some of that description could usefuly be added to `man dmesg` ?
I agree.
> Might some commiter wnat to hack a few words in ? Or do we neeed
> a formal send-pr (that a commiter would rephrase likely anyway, so
> best skip the send-pr ? ).
If you have the time, please submit a PR (docs category).
I'll take care of it.
You're a native English speaker. I am not. So chances
are that I won't rephrase it, except for technical
reasons. And even if I did rephrase it, it's still a
good thing to have a PR, so the issue doesn't get lost
and forgotten.
> > > - I tried loader.conf kern.msgbuf=64000
> >
> > I think it must be a multiple of the pages size, i,e,
> > 4K = 4096 on FreeBSD/i386. I usually set it to 65536
> > or 131072.
> [...]
> Puzzled on syntax to set size in loader.conf ?
Unfortunately it's a kernel constant, not a tunable.
The only way to change it is via "options MSGBUF_SIZE=..."
in your kernel config file, and rebuild the kernel.
Best regards
Oliver
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