freebsd stable - Jan 2005 - panic: PAE with 16GB ram

Hi,
I use Tyan S2882 with dual Opteron and FreeBSD 4.10-RELEASE with
PAE support. it works fine with 8GB and 12GB ram, but panics with
16GB (with the same kernel) :

Fatal trap 12: page fault while in kernel mode
mp_lock = 00000009; cpuid = 0; lapic.id = 00000000
fault virtual address   = 0x69bc8000
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0x6a259d26
stack pointer           = 0x10:0x6a3b3f44
frame pointer           = 0x10:0x6a3b3f5c
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
trap number             = 12
panic: page fault
mp_lock = 00000009; cpuid = 0; lapic.id = 00000000
Uptime: 0s

The same thing occurs in both 4.10-RELEASE and 4.11-stable. I even
loaded the fault-safe setting in BIOS but it was still not working.
my dmesg is in http://www.in2home.org/download/dmesg, and kernel
config is in http://www.in2home.org/download/kernel .

thanks for your help. :)

On Mon, Jan 17, 2005 at 11:29:25AM +0800, in2 wrote:
> Hi,
> I use Tyan S2882 with dual Opteron and FreeBSD 4.10-RELEASE with
> PAE support. it works fine with 8GB and 12GB ram, but panics with
> 16GB (with the same kernel) :
the kernel panics just after booting:

Console: serial port
BIOS drive C: is disk0
BIOS 639kB/4127744kB available memory

FreeBSD/i386 bootstrap loader, Revision 0.8
(root@, Mon Jan 10 12:08:32 CST 2005)
Loading /boot/defaults/loader.conf
/kernel text=0x19be7d data=0x23080+0x1d670 syms=[0x4+0x27350+0x4+0x2dc3e]
/
Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [kernel]...
Copyright (c) 1992-2005 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.


Fatal trap 12: page fault while in kernel mode
mp_lock = 00000009; cpuid = 0; lapic.id = 00000000
fault virtual address   = 0x69bc8000
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0x6a259d26
stack pointer           = 0x10:0x6a3b3f44
frame pointer           = 0x10:0x6a3b3f5c
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
trap number             = 12
panic: page fault
mp_lock = 00000009; cpuid = 0; lapic.id = 00000000
Uptime: 0s

and here is my /boot/loader.conf:
userconfig_script_load="YES"
console=comconsole
kern.maxproc=30000

I tried to increase KVA_PAGES from 1200 to 1400 but it did not
work. is there any suggestion? thanks for your help :)

in2 wrote:
> On Mon, Jan 17, 2005 at 11:29:25AM +0800, in2 wrote:
> 
>>Hi,
>>I use Tyan S2882 with dual Opteron and FreeBSD 4.10-RELEASE with
>>PAE support. it works fine with 8GB and 12GB ram, but panics with
>>16GB (with the same kernel) :
> 
> the kernel panics just after booting:
> 
This is a known deficiency in the low-level startup code.  Try editing
/sys/i386/include/pmap.h and doubling or quadroupling the value of
NKPT.

Scott