Weird Real memory reported with 5.4 PAE support

Tamouh H. hakmi at
Fri Sep 30 08:38:56 PDT 2005


We have a Supermicro that has Winston 4GB of ECC Registered DDR333 RAM. Dual
Xeon Processors.

With PAE enabled, it seems the system reports 6GB of realmemory instead of
4GB, as below:

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.
FreeBSD 5.4-RELEASE #2: Thu Sep 29 13:04:56 EDT 2005
    root at
ACPI APIC Table: <PTLTD          APIC  >
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2793.01-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf41  Stepping = 1

  Hyperthreading: 2 logical CPUs
real memory  = 6442450944 (6144 MB)  <<<<< Notice how large this amount
avail memory = 4162482176 (3969 MB)
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  6
 cpu3 (AP): APIC ID:  7
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 24-47 on motherboard
ioapic2 <Version 2.0> irqs 48-71 on motherboard
ioapic3 <Version 2.0> irqs 72-95 on motherboard
ioapic4 <Version 2.0> irqs 96-119 on motherboard
acpi0: <PTLTD   RSDT> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0

We're experiencing Kenerl Fault Trap 12 panics in page faults and thinking
this maybe related. Any ideas ?

These are the extra options in our i386 Kernel config:

options         PAE                     # ENABLE PAE SUPPORT
options         SMP                     # ENABLE MULTI PROCESSOR
options         QUOTA                   # ENABLE QUOTA SUPPORT

makeoptions     NO_MODULES=YES          # ENABLED FOR PAE SUPPORT

device          apic                    # I/O APIC
device          acpi                    # COMPILE FOR SMP OPTION



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