From owner-freebsd-hackers  Mon May 21 13:48:29 2001
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	 Mon, 21 May 2001 13:45:03 -0700
Date: Mon, 21 May 2001 13:51:28 +0000 (GMT)
From: Tim Wiess <twiess@ahaza.com>
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To: David Greenman <dg@root.com>
Cc: <hackers@freebsd.org>
Subject: Re: 4GB
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David,
That was it!
Thanks for your help.

tim


On Mon, 21 May 2001, David Greenman wrote:

> >Hello all,
> >I've been experiencing some major problems running FreeBSD on 4GB of
> >memory, and I was curious if anyone has experienced this before.
> >
> >Bascially, the problem is that FreeBSD just won't boot. Shortly after the
> >kernel gains control of the system, it panics...
> >
> >Fatal trap 12: page fault while in kernel mode
> >mp_lock = 0000000b; cpuid = 0; lapic.id = 00000000
> >fault virtual address   = 0xbff11000
> >fault code              = supervisor write, page not present
> >instruction pointer     = 0x8:0xc027e48c
> >stack pointer           = 0x10:0xc03c4f30
> >frame pointer           = 0x10:0xc03c4f3c     95
> >code segment            = base 0x0, limit 0xfffff, type 0x1b
> >                        = DPL 0, pres 1, def32 1, gran 1
> >processor eflags        = interrupt enabled, resume, IOPL = 0
> >current process         = Idle
> >interrupt mask          = net tty bio cam  <- SMP: XXX
> >kernel: type 12 trap, code=0
> >Stopped at      0xc027e48c:     movl    %edx,0xbfc00000(,%eax,4)
> >
> >The IP is pointing to the pmap_map() loop. So it's clearly having problems
> >mapping out the VM.
> >
> >I have yet to do any rigorous debugging, but I thought I would run this by
> >the mailing list before I do. The system is running on a Tyan Tiger LE
> >board with dual PIIIs (860Mhz) and 4 1GB (133Mhz) SiliconTech chips.
> >
> >I have tested Linux on this same configuration, and while it boots
> >normally, it will eventually panic with a similar error once you start
> >doing some real work.
> >
> >Any thoughts?
>
>    The kernel is probably running out of the initially allocated kernel page
> table pages. Try upping it with 'options NKPT=64' in your kernel config
> file.
>
> -DG
>
> David Greenman
> Co-founder, The FreeBSD Project - http://www.freebsd.org
> President, TeraSolutions, Inc. - http://www.terasolutions.com
> Pave the road of life with opportunities.
>


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