Hi,



BIOS Settings show

=====================================

Total Memory     : 4096 MB with 8 MB Shared Memory
                          : Dual - Channel Memory Mode

DDRII1                 : 2048 MB/266 MHz (DDRII533)
DDRII2                 : 2048 MB/266 MHz (DDRII533)

======================================

There are no setting to limit RAM in BIOS and so on also.

but OpenBSD 4.7/amd64 SMP detects only 3 GB.

Is there anything more I should do to get the other 1 GB of RAM
recognized by the System?

Thanks

--Siju

dmesg below--------------


OpenBSD 4.7 (GENERIC.MP) #130: Wed Mar 17 20:48:50 MDT 2010
    deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 3077242880 (2934MB)
avail mem = 2987610112 (2849MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.3 @ 0xfbc30 (12 entries)
bios0: vendor American Megatrends Inc. version "P1.00" date 06/12/2006
acpi0 at bios0: rev 0
acpi0: tables DSDT FACP APIC MCFG OEMB
acpi0: wakeup devices P0P2(S4) P0P1(S4) PS2K(S4) PS2M(S4) UAR1(S4)
EUSB(S4) MC97(S4) HDAC(S4) P0P4(S4) P0P5(S4) P0P6(S4) P0P7(S4)
P0P8(S4) P0P9(S4) USB0(S4) USB1(S4) USB2(S4) USB3(S4) SLPB(S4)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Pentium(R) D CPU 2.66GHz, 2659.72 MHz
cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,TM2,CNXT-ID,CX16,xTPR,LONG
cpu0: 1MB 64b/line 8-way L2 cache
cpu0: apic clock running at 132MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Pentium(R) D CPU 2.66GHz, 2659.31 MHz
cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,TM2,CNXT-ID,CX16,xTPR,LONG
cpu1: 1MB 64b/line 8-way L2 cache
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 1, remapped ...
[ message continues ]

This is normal. Large memory support is not yet included in
OpenBSD by default for amd64.

[ message continues ]

On Thu, May 27, 2010 at 3:22 PM, Peter Kay (Syllopsium)

Is there anything I can do  to get this by recompiling the kernel or something?

Thanks

--Siju

[ message continues ]

Yes and no; google for 'bigmem' in the misc list for marc.info. You have to 
edit
a source file and recompile the kernel.

However, it won't work (to be precise, it will probably crash on boot, or 
possibly
afterwards) unless you have an IOMMU, and most Intel systems don't.

OpenBSD doesn't support the AGP/PCI-e GART as an IOMMU, and I'm not sure
if it supports VT-d platforms (which you probably aren't running anyway). 
The
only option here is AMD.

Until the devs tell us it's working, it's not worth persevering with.

PK 

[ message continues ]

bad advice.  Don't do it, there is a reason it isn't disabled.

send oga some beer for c2k10 instead he might feel more pressure that
way :-)


[ message continues ]

Forgive me for the noob question (i'm a newbie at openbsd), but if i 
want to build, for example, a large squid cache using openbsd, in a 
server with BIIIG ram (12gb+), i will no be able to use the full memory 
space? is this what you guys are saying?

[ message continues ]

That is correct.  12G of ram for web cache?  Why not a better disk
instead?

[ message continues ]

Hi Marco, tks for your anwser. Maybe i have not choosed the best 
example, but the question is answered.
IMHO, this serious limits the use of OpenBSD in tasks that takes huge 
memory space to execute. There is an serious effort to avoid this 
limitation?

I'm not pushing anything, and i'm fully aware that developers does this 
system because they want, and not to satisfy my personal needs. I just 
want to be well informed to not talk any bulls**t.

Tks in advance and sorry for my poor english.

[ message continues ]

Yep, there are plans to work on it during c2k10 hackathon. Support for
big mem was enabled in the past (in 4.4 for some short time???), but
there were problems with it. Of course you can try to enable it by
your self. It's easy change and how to do that is in couple of threads
in mailing list archives.

So if you need this amount of memory then you can try to enable it or
maybe use different OS for now. No one OS is best for everything. Not
even OpenBSD which is great in so many areas.


On Thu, May 27, 2010 at 7:48 PM, Leonardo Carneiro - Veltrac

[ message continues ]

Maybe people need to sit down and invent cases in order to figure out why
this is a REAL, SERIOUS ISSUE(tm) and later figure that the invented case
wasn't valid,
but there must be an ISSUE anyhow.

Sure, everybody wants to use all ram, but unless someone says "it might blow
up if you experiment", I'd rather stick to a 3+ G squid
cache than experiment with bouncebuffered devices and
I-dont-know-how-well-it-works-IOMMUs if I was serious about web caching.


-- 
To our sweethearts and wives.  May they never meet. -- 19th century toast

[ message continues ]

It's not because you or me didn't said about an example that use tons of 
RAM, doesn't mean that such scenarios does not exist. I develop a 
application in java that serves more than ten thousand clients, and in 
top hours it's sure to use at least 2,5gb (this single process). I 
didn't want to expose my personal example, but if you want one, here it is.

[ message continues ]

Incorrect, that is all we support on amd64 right now.

there are a few machines where it mystically does not work, though. That

Being worked on, needs some changes that hopefully will be done at
c2k10, we definitely have access to a machine with the intel VT stuff,
the amd64 new shiny iommu i'm not sure if we have hardware yet.

That is the best approach for now.

-0-
-- 
Stupid, adj.:
	Losing $25 on the game and $25 on the instant replay.

[ message continues ]

Thanks to all of you for the latest info :-)

--Siju

[ message continues ]