From owner-freebsd-hackers  Mon May 21 12:58: 6 2001
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Date: Mon, 21 May 2001 12:52:38 -0700
From: David Greenman <dg@root.com>
To: Tim Wiess <twiess@ahaza.com>
Cc: hackers@freebsd.org
Subject: Re: 4GB
Message-ID: <20010521125238.R19893@nexus.root.com>
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>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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