FreeBSD 7.0R and 7.0CURRENT (amd64) show only 2, 5Gb RAM from 8Gb

Nifty violentsense at
Mon May 19 19:03:36 UTC 2008


Ok, so FreeBSD can use more than ~3Gb of RAM only on server platforms? As I
understand from your posts:
I spent one day, try install FreeBSD (7.0 release and snapshot) and OpenBSD
(4.3 release and snapshot) 
on both of my PC's and get nothing :(

I can see real size of memory only if type 'machine memory' at boot prompt.
If I do this - I see rest of memory (4+ Gb), as a last memory region mapped
from 0x100000000 address.
But FreeBSD (and OpenBSD) just ignore this memory :(


From: Bruno Taranto Alvim [mailto:btaranto at] 
Sent: Monday, May 19, 2008 9:46 PM
To: Nifty; freebsd-amd64 at
Subject: Re: FreeBSD 7.0R and 7.0CURRENT (amd64) show only 2, 5Gb RAM from

CPU: Intel(R) Xeon(R) CPU           X5460  @ 3.16GHz (3158.76-MHz K8-class
  Origin = "GenuineIntel"  Id = 0x10676  Stepping = 6
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  Cores per package: 4
usable memory = 8571494400 (8174 MB)
avail memory  = 8284160000 (7900 MB)
ACPI APIC Table: <DELL   PE_SC3  >
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs

On Mon, May 19, 2008 at 2:37 PM, Steve Kargl
<sgk at> wrote:
On Mon, May 19, 2008 at 08:49:41PM +0400, Nifty wrote:
> Hi!
> I have two PC's based on iP965 and iG33 chipsets,
> both have iC2D Quad 2.4GHz CPU and both have 8Gb (4 x 2Gb) PC2-6400 RAM.
> After installing FreeBSD 7.0R (amd64) and FreeBSD 7.0CURRENT (amd64) -
> on iP965 dmesg show me 2,5Gb of RAM, on iG33 dmesg show 3,1Gb of RAM :(
> Can anybody explain to me, does FreeBSD support m/b with 4 memory slot and
> 8Gb of RAM or not?

Yes, it supports more than 4 Gb.

CPU: AMD Opteron(tm) Processor 248 (2192.35-MHz K8-class CPU)
 Origin = "AuthenticAMD"  Id = 0xf5a  Stepping = 10
 AMD Features=0xe0500800<SYSCALL,NX,MMX+,LM,3DNow!+,3DNow!>
usable memory = 8513187840 (8118 MB)
avail memory  = 8249532416 (7867 MB)

troutmask:kargl[208] uname -m

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Bruno Taranto Alvim 

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