Re: FreeBSD 5.1-R kernel panic

From: Stephane Raimbault (segr_at_hotmail.com)
Date: 07/23/03

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    To: <current@freebsd.org>
Date: Wed, 23 Jul 2003 09:56:32 -0600

    Hi Bosko,

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

    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,
    Stephane.

    ----- Original Message -----
    From: "Bosko Milekic" <bmilekic@technokratis.com>
    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
    option.
    > >
    > > kern.vm.kmem.size="350000"
    > >
    > > As far as changing the nmbclusters, I'm not sure how many I use now. Do
    you
    > > know where I could get some values as what the total vs. how much is
    being
    > > used for the above values? I'll setup some graphs to monitor those
    values
    > > for me and get an idea of how much the system is using and when if I
    can.
    >
    > '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
    just
    > > yet what I needed to change to the kernel to provide a stack trace... do
    you
    > > know what options I should be adding to my kernel? Also, should I try
    not
    > > to use an SMP kernel and just run GENERIC to see if continues to have
    the
    > > problem? I can probably run on one CPU for a few days, especially over
    the
    > > 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@technokratis.com * bmilekic@FreeBSD.org
    > TECHNOkRATIS Consulting Services * http://www.technokratis.com/
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