FreeBSD 5.1-R kernel panic

Stephane Raimbault segr at
Wed Jul 23 08:56:43 PDT 2003

Hi Bosko,

Looking at netstat -m, the value I'd probably be interested in is the

3% of cluster map consumed

knowing that the Maximum possible is 25600 I can deduce that ~768 are being
used?  Is that correct.  I'm not much of a programmer, but I did recognize
the printf(); statements from a C class I didn't do well in half a decade
ago... as you can tell, I'm not much of a programmer :).  If it's not the 3%
I should be paying attention too... then let me know :)

As for using the option DDB in my kernel, I do have one question.  I do have
remote console access that I use to go into single user mode on the box
remotely.  I'm suspecting I could use the debugger mode over the
comconsole... I just want to make sure there is some kind of reboot command
from the debugger so that I can tell the box to reboot once I've captured
the stack trace?  If so, I'll enable the DDB tonight and get you the info as
soon as I can.

thanks again,

----- Original Message ----- 
From: "Bosko Milekic" <bmilekic at>
Newsgroups: mailing.freebsd.current
Sent: Wednesday, July 23, 2003 9:28
Subject: Re: FreeBSD 5.1-R kernel panic

> On Wed, Jul 23, 2003 at 09:24:24AM -0600, Stephane Raimbault wrote:
> > Thanks Bosko,
> >
> > I've changed my /boot/loader.conf to reflect the kern.vm.kmem.size
> >
> > kern.vm.kmem.size="350000"
> >
> > As far as changing the nmbclusters, I'm not sure how many I use now.  Do
> > know where I could get some values as what the total vs. how much is
> > used for the above values?  I'll setup some graphs to monitor those
> > for me and get an idea of how much the system is using and when if I
>   'netstat -m'
>   You can access the relevant sysctls directly; take a look at the way
>   netstat does it in src/usr.bin/netstat/mbuf.c
> > Also, I took a quick look at the developers handbook and couldn't find
> > yet what I needed to change to the kernel to provide a stack trace... do
> > know what options I should be adding to my kernel?  Also, should I try
> > to use an SMP kernel and just run GENERIC to see if continues to have
> > problem?  I can probably run on one CPU for a few days, especially over
> > weekend.
>   At the very least, you need "options DDB".  This will drop you into
>   the debugger on a kernel panic, at which point you can just issue 'tr'
>   to get a stack trace.  Be careful, if you only have remote access to
>   the machine, this is generally not a good idea.
> > Thanks,
> > Stephane.
> -- 
> Bosko Milekic  *  bmilekic at  *  bmilekic at
> TECHNOkRATIS Consulting Services  *
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