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#1 2013-11-14 11:41:44

dimti
Member
Registered: 2013-11-06
Posts: 11

RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

Hello.

Im begginer in this forum.
Search for my question - not found results.

Some time ago, im buy more ram memory to the insert in my computer.
My computer have 2Gb ram memory. (two planks on 1 Gb)
I buy more memory, increase to 4Gb (add two planks on 1 Gb)
BIOS calculated - 4Gb
But, archlinux reported me - 3Gb


[root@prototype dimti]# free -m
             total       used       free     shared    buffers     cached
Mem:          3033       2808        224          0         77        998
-/+ buffers/cache:       1733       1300
Swap:         2036        828       1208
[root@prototype dimti]# cat /proc/meminfo
MemTotal:        3106104 kB
MemFree:          186508 kB

dmidecode

Handle 0x0008, DMI type 5, 24 bytes
Memory Controller Information
    Error Detecting Method: 64-bit ECC
    Error Correcting Capabilities:
        None
    Supported Interleave: One-way Interleave
    Current Interleave: One-way Interleave
    Maximum Memory Module Size: 4096 MB
    Maximum Total Memory Size: 16384 MB
    Supported Speeds:
        Other
    Supported Memory Types:
        DIMM
        SDRAM
    Memory Module Voltage: 3.3 V
    Associated Memory Slots: 4
        0x0009
        0x000A
        0x000B
        0x000C
    Enabled Error Correcting Capabilities:
        None

Handle 0x0009, DMI type 6, 12 bytes
Memory Module Information
    Socket Designation: DIMM0
    Bank Connections: 0 1
    Current Speed: Unknown
    Type: DIMM SDRAM
    Installed Size: 1024 MB (Single-bank Connection)
    Enabled Size: 1024 MB (Single-bank Connection)
    Error Status: OK

Handle 0x000A, DMI type 6, 12 bytes
Memory Module Information
    Socket Designation: DIMM1
    Bank Connections: 2 3
    Current Speed: Unknown
    Type: DIMM SDRAM
    Installed Size: 1024 MB (Single-bank Connection)
    Enabled Size: 1024 MB (Single-bank Connection)
    Error Status: OK

Handle 0x000B, DMI type 6, 12 bytes
Memory Module Information
    Socket Designation: DIMM2
    Bank Connections: 4 5
    Current Speed: Unknown
    Type: DIMM SDRAM
    Installed Size: 1024 MB (Single-bank Connection)
    Enabled Size: 1024 MB (Single-bank Connection)
    Error Status: OK

Handle 0x000C, DMI type 6, 12 bytes
Memory Module Information
    Socket Designation: DIMM3
    Bank Connections: 6 7
    Current Speed: Unknown
    Type: DIMM SDRAM
    Installed Size: 1024 MB (Single-bank Connection)
    Enabled Size: 1024 MB (Single-bank Connection)
    Error Status: OK

Please. help.What can I do?

Last edited by dimti (2013-11-14 15:02:33)

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#2 2013-11-14 11:44:38

Allan
Pacman
From: Brisbane, AU
Registered: 2007-06-09
Posts: 11,400
Website

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

Are you using i686 or x86_64?

PGP Key: F99FFE0FEAE999BD

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#3 2013-11-14 11:45:40

dimti
Member
Registered: 2013-11-06
Posts: 11

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

May be i686

[root@prototype dimti]# uname -a
Linux prototype.dimti.ru 3.11.6-1-ARCH #1 SMP PREEMPT Sat Oct 19 00:29:46 CEST 2013 i686 GNU/Linux

Last edited by dimti (2013-11-14 15:02:44)

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#4 2013-11-14 12:00:42

Allan
Pacman
From: Brisbane, AU
Registered: 2007-06-09
Posts: 11,400
Website

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

That would be why.  We do not enable PAE in our i686 kernel, so you get 3GB of RAM max.   You can either compiler your own kernel using ABS, or change to x86_64.

PGP Key: F99FFE0FEAE999BD

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#5 2013-11-14 12:09:35

dimti
Member
Registered: 2013-11-06
Posts: 11

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

That article - https://wiki.archlinux.org/index.php/Ke … raditional - be able to help me?

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#6 2013-11-14 12:15:19

Allan
Pacman
From: Brisbane, AU
Registered: 2007-06-09
Posts: 11,400
Website

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

I'd look at this: https://wiki.archlinux.org/index.php/Ke … ild_System

PGP Key: F99FFE0FEAE999BD

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#7 2013-11-14 12:27:16

andy123
Member
Registered: 2011-11-04
Posts: 169
Website

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

While using PAE "works", is there any reason for you not to switch to x86_64?

I don't know as much as I want about things like PAE, but articles like this one: https://cl4ssic4l.wordpress.com/2011/05 … about-pae/ make it look like a bad idea.

i'm sorry for my poor english wirting skills…

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#8 2013-11-14 12:41:08

dimti
Member
Registered: 2013-11-06
Posts: 11

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

Thanks Allan, thanks Andy
I see in this article - PAE is bad idea
"... when in reality it is fragile as hell and works only with duct-tape and prayers  ..."

Question:
For merge to x86_64 processor, Im need to reinstalled OS? (If im buy new microprocessor and motherboard)

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#9 2013-11-14 12:52:49

andy123
Member
Registered: 2011-11-04
Posts: 169
Website

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

Well, there are ways to migrate (https://wiki.archlinux.org/index.php/Mi … installing) but reinstalling is probably better.
I simply assumed, that your processor is x86_64 capable but you aren't using it, because the technology was literally released over a decade ago.

i'm sorry for my poor english wirting skills…

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#10 2013-11-14 12:59:17

dimti
Member
Registered: 2013-11-06
Posts: 11

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

Hmm..

My processer my be support is 64-bit arhcitecture (That would be great)

dmidecode:

Handle 0x0004, DMI type 4, 40 bytes
Processor Information
	Socket Designation: CPU 1
	Type: Central Processor
	Family: Core 2 Duo
	Manufacturer: Intel            
	ID: FB 06 00 00 FF FB EB BF
	Signature: Type 0, Family 6, Model 15, Stepping 11
	Flags:
		FPU (Floating-point unit on-chip)
		VME (Virtual mode extension)
		DE (Debugging extension)
		PSE (Page size extension)
		TSC (Time stamp counter)
		MSR (Model specific registers)
		PAE (Physical address extension)
		MCE (Machine check exception)
		CX8 (CMPXCHG8 instruction supported)
		APIC (On-chip APIC hardware supported)
		SEP (Fast system call)
		MTRR (Memory type range registers)
		PGE (Page global enable)
		MCA (Machine check architecture)
		CMOV (Conditional move instruction supported)
		PAT (Page attribute table)
		PSE-36 (36-bit page size extension)
		CLFSH (CLFLUSH instruction supported)
		DS (Debug store)
		ACPI (ACPI supported)
		MMX (MMX technology supported)
		FXSR (FXSAVE and FXSTOR instructions supported)
		SSE (Streaming SIMD extensions)
		SSE2 (Streaming SIMD extensions 2)
		SS (Self-snoop)
		HTT (Multi-threading)
		TM (Thermal monitor supported)
		PBE (Pending break enabled)
	Version: Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz     
	Voltage: 1.3 V
	External Clock: 267 MHz
	Max Speed: 2400 MHz
	Current Speed: 2136 MHz
	Status: Populated, Enabled
	Upgrade: Other
	L1 Cache Handle: 0x0005
	L2 Cache Handle: 0x0006
	L3 Cache Handle: 0x0007
	Serial Number: To Be Filled By O.E.M.
	Asset Tag: To Be Filled By O.E.M.
	Part Number: To Be Filled By O.E.M.
	Core Count: 4
	Core Enabled: 4
	Thread Count: 4
	Characteristics:
		64-bit capable

So, I can install the 64-bit version of the OS?

Last edited by dimti (2013-11-14 15:03:03)

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#11 2013-11-14 13:31:49

ba
Member
Registered: 2011-04-22
Posts: 5

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

So, I can install the 64-bit version of the OS?

Yes.

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#12 2013-11-14 13:31:51

cedeel
Member
From: ~
Registered: 2009-08-25
Posts: 176
Website

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

Why you keep posting your dmidecode output is beyond me, but have you tried booting the 64 bit arch installer? That would be the easiest way to find out rather than asking on here and waiting for an answer.

My (rather inactive) blog

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#13 2013-11-14 14:28:10

karol
Archivist
Registered: 2009-05-06
Posts: 25,440

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

dimti, when posting configs, code or command output, please use [ code ] tags https://bbs.archlinux.org/help.php#bbcode

like this

It makes the code more readable and - in case of longer listings - more convenient to scroll through.

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#14 2013-11-14 15:05:15

dimti
Member
Registered: 2013-11-06
Posts: 11

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

Thanks.
I try to use x86_64 architecture after resolve my current project.
Greatefull thanks.

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#15 2013-11-14 15:12:34

karol
Archivist
Registered: 2009-05-06
Posts: 25,440

Re: RAM memory installed - 4Gb. ArchLinux detect 3GB. Why?

You can read http://blog.superuser.com/2011/04/23/wa … g-32-bits/ if you're interested.

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