4GB memory and more

[Robert Fitzpatrick]

I have a couple of Supermicro servers and upgraded both with more
memory. I upgraded our ESMTP server from 1GB to 4GB and our MX server
from 2GB to 5GB. Below are the dmesg memory findings and, yes, I get the
memory over 4GB ignored when booting up. The ESMTP even says that about
130MB is ignored. I was reading about building into the kernel PAE
options for using above 4GB of memory, but in the dmesg I see PAE in the
Features. Does this mean the support is there and I just need some BIOS
tweaking?

esmtp# dmesg
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 #1: Tue Dec 13 16:00:53 EST 2005
    admin at esmtp.webtent.net:/usr/src/sys/i386/compile/WEBTENT
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2399.33-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf25  Stepping = 5
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Hyperthreading: 2 logical CPUs
real memory  = 4160225280 (3967 MB)
avail memory = 4073279488 (3884 MB)
<snip>

mx1# dmesg
Copyright (c) 1992-2007 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 is a registered trademark of The FreeBSD Foundation.
FreeBSD 6.2-RELEASE-p5 #0: Sat Jun  2 11:11:40 EDT 2007
    root at mx1.webtent.net:/usr/obj/usr/src/sys/WEBTENT
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 3.00GHz (3000.12-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf41  Stepping = 1
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0x641d<SSE3,RSVD2,MON,DS_CPL,CNTX-ID,CX16,<b14>>
  AMD Features=0x20100000<NX,LM>
  Logical CPUs per core: 2
real memory  = 3220635648 (3071 MB)
avail memory = 3150565376 (3004 MB)
<snip>

Thanks in advance.

-- 
Robert