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Guillermo Leira

21 Sep 2012 21 Sep '12

10:37 a.m.

Hello! I've installed an x86_64 Arch on a PC with 8 GB, but it seems to be seeing just four. What have I done wrong? Bios sees 4 x 2GB Modules and reports 8 GB, but top or free report only 4 GB. Best Regards Guillermo Leira

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Roel Deckers

21 Sep 21 Sep

10:46 a.m.

Does the missing memory show up in other OSs? It can be faulty ram if it doesn't show up in any OS, recently had that problem. On Fri, Sep 21, 2012 at 12:37 PM, Guillermo Leira wrote:

Hello!

I've installed an x86_64 Arch on a PC with 8 GB, but it seems to be seeing just four. What have I done wrong?

Bios sees 4 x 2GB Modules and reports 8 GB, but top or free report only 4 GB.

Best Regards

Guillermo Leira

Aurko Roy

10:47 a.m.

On Fri, Sep 21, 2012 at 4:16 PM, Roel Deckers wrote:

Does the missing memory show up in other OSs? It can be faulty ram if it doesn't show up in any OS, recently had that problem.

On Fri, Sep 21, 2012 at 12:37 PM, Guillermo Leira wrote:

...
Hello!

I've installed an x86_64 Arch on a PC with 8 GB, but it seems to be seeing just four. What have I done wrong?

Bios sees 4 x 2GB Modules and reports 8 GB, but top or free report only 4 GB.

Best Regards

Guillermo Leira

You could try running memtest86+ on boot and see if it detects the additional memory. -- Aurko Roy GPG key: 0x20C5BC31 Fingerprint:76B4 9677 15BE 731D 1949 85BA 2A31 B442 20C5 BC31

Ralf Mardorf

12:48 p.m.

On Fri, 2012-09-21 at 16:17 +0530, Aurko Roy wrote:

On Fri, Sep 21, 2012 at 4:16 PM, Roel Deckers wrote:

...
Does the missing memory show up in other OSs? It can be faulty ram if it doesn't show up in any OS, recently had that problem.

On Fri, Sep 21, 2012 at 12:37 PM, Guillermo Leira wrote:

...
Hello!

I've installed an x86_64 Arch on a PC with 8 GB, but it seems to be seeing just four. What have I done wrong?

Bios sees 4 x 2GB Modules and reports 8 GB, but top or free report only 4 GB.

Best Regards

Guillermo Leira

You could try running memtest86+ on boot and see if it detects the additional memory.

I never heard that anybody solved this issue, but I read that many people have this issue too. On my computer there are only 3 GB + 768 MB of 4 MB available. The graphics has got it's own framebuffer, 256 MB, but IIRC I once have seen that the framebuffer is 512 MB. I guess I can see it running NVIDIA settings, but at the moment I can't run it, because I'm using the nv driver. IIRC memtest86+ did always show the complete memory on my machine. I don't care, since it doesn't make a difference if I got 4GB or 3.8GB. However, I read often about this 8GB issue, for different distros. And it where definitive threads about 64-bit architecture, not about 32-bit and PAE issues. Regards, Ralf

Kevin Chadwick

1:48 p.m.

New subject: [arch-general] [Bulk] Re: Can't see all my memory

I never heard that anybody solved this issue, but I read that many people have this issue too.

On my computer there are only 3 GB + 768 MB of 4 MB available. The graphics has got it's own framebuffer, 256 MB, but IIRC I once have seen that the framebuffer is 512 MB. I guess I can see it running NVIDIA settings, but at the moment I can't run it, because I'm using the nv driver. IIRC memtest86+ did always show the complete memory on my machine. I don't care, since it doesn't make a difference if I got 4GB or 3.8GB. However, I read often about this 8GB issue, for different distros. And it where definitive threads about 64-bit architecture, not about 32-bit and PAE issues.

Yes on 64 bit systems you will see the maximum memory. On 32 bit you need a PAE enabled kernel to get any more than 4Gig. If you have less than 4Gig you may want to use the PAE kernel in any case because if you have a relatively modern cpu it will support hardware Non execute protection. On a non-PAE kernel you will see NX protection disabled or such in dmesg. -- _______________________________________________________________________ 'Write programs that do one thing and do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface' (Doug McIlroy) _______________________________________________________________________

Ralf Mardorf

2:10 p.m.

New subject: [arch-general] [Bulk] Re: Can't see all my memory

On Fri, 2012-09-21 at 14:48 +0100, Kevin Chadwick wrote:

...
I never heard that anybody solved this issue, but I read that many people have this issue too.

On my computer there are only 3 GB + 768 MB of 4 MB available. The graphics has got it's own framebuffer, 256 MB, but IIRC I once have seen that the framebuffer is 512 MB. I guess I can see it running NVIDIA settings, but at the moment I can't run it, because I'm using the nv driver. IIRC memtest86+ did always show the complete memory on my machine. I don't care, since it doesn't make a difference if I got 4GB or 3.8GB. However, I read often about this 8GB issue, for different distros. And it where definitive threads about 64-bit architecture, not about 32-bit and PAE issues.

Yes on 64 bit systems you will see the maximum memory. On 32 bit you need a PAE enabled kernel to get any more than 4Gig. If you have less than 4Gig you may want to use the PAE kernel in any case because if you have a relatively modern cpu it will support hardware Non execute protection. On a non-PAE kernel you will see NX protection disabled or such in dmesg.

I'm using 64-bit architecture. [spinymouse@archlinux ~]$ uname -a Linux archlinux 3.4.4-rt14-1-rt #1 SMP PREEMPT RT Fri Jul 20 13:16:40 UTC 2012 x86_64 GNU/Linux [spinymouse@archlinux ~]$ hwinfo --memory 01: None 00.0: 10102 Main Memory [Created at memory.66] Unique ID: rdCR.CxwsZFjVASF Hardware Class: memory Model: "Main Memory" Memory Range: 0x00000000-0xf7b84fff (rw) Memory Size: 3 GB + 768 MB

Victor Silva

1:52 p.m.

2012/9/21 Ralf Mardorf

On Fri, 2012-09-21 at 16:17 +0530, Aurko Roy wrote:

...
On Fri, Sep 21, 2012 at 4:16 PM, Roel Deckers
...
Does the missing memory show up in other OSs? It can be faulty ram if it doesn't show up in any OS, recently had that problem.

On Fri, Sep 21, 2012 at 12:37 PM, Guillermo Leira wrote:

...
Hello!

I've installed an x86_64 Arch on a PC with 8 GB, but it seems to be seeing just four. What have I done wrong?

Bios sees 4 x 2GB Modules and reports 8 GB, but top or free report only 4 GB.

Best Regards

Guillermo Leira

You could try running memtest86+ on boot and see if it detects the additional memory.

I never heard that anybody solved this issue, but I read that many people have this issue too.

On my computer there are only 3 GB + 768 MB of 4 MB available. The graphics has got it's own framebuffer, 256 MB, but IIRC I once have seen that the framebuffer is 512 MB. I guess I can see it running NVIDIA settings, but at the moment I can't run it, because I'm using the nv driver. IIRC memtest86+ did always show the complete memory on my machine. I don't care, since it doesn't make a difference if I got 4GB or 3.8GB. However, I read often about this 8GB issue, for different distros. And it where definitive threads about 64-bit architecture, not about 32-bit and PAE issues.

Regards, Ralf

Ralf, if I got right you can't find the buffer memory right? Assuming you got a gpu why don't you disable the buffer on the bios?

Ralf Mardorf

2:13 p.m.

On Fri, 2012-09-21 at 10:52 -0300, Victor Silva wrote:

2012/9/21 Ralf Mardorf

...
On Fri, 2012-09-21 at 16:17 +0530, Aurko Roy wrote:

...
On Fri, Sep 21, 2012 at 4:16 PM, Roel Deckers
...
Does the missing memory show up in other OSs? It can be faulty ram if it doesn't show up in any OS, recently had that problem.

On Fri, Sep 21, 2012 at 12:37 PM, Guillermo Leira wrote:

...
Hello!

I've installed an x86_64 Arch on a PC with 8 GB, but it seems to be seeing just four. What have I done wrong?

Bios sees 4 x 2GB Modules and reports 8 GB, but top or free report only 4 GB.

Best Regards

Guillermo Leira

You could try running memtest86+ on boot and see if it detects the additional memory.

I never heard that anybody solved this issue, but I read that many people have this issue too.

On my computer there are only 3 GB + 768 MB of 4 MB available. The graphics has got it's own framebuffer, 256 MB, but IIRC I once have seen that the framebuffer is 512 MB. I guess I can see it running NVIDIA settings, but at the moment I can't run it, because I'm using the nv driver. IIRC memtest86+ did always show the complete memory on my machine. I don't care, since it doesn't make a difference if I got 4GB or 3.8GB. However, I read often about this 8GB issue, for different distros. And it where definitive threads about 64-bit architecture, not about 32-bit and PAE issues.

Regards, Ralf

Ralf, if I got right you can't find the buffer memory right? Assuming you got a gpu why don't you disable the buffer on the bios?

It is disabled in the BIOS and in the past there where no issues. I don't know when this issue occurred for the first time, but there where no BIOS updates, just kernel updates. Regards, Ralf

Guillermo Leira

6:55 p.m.

-----Mensaje original----- De: arch-general [mailto:arch-general-bounces@archlinux.org] En nombre de Ralf Mardorf Enviado el: viernes, 21 de septiembre de 2012 14:49 Para: General Discussion about Arch Linux Asunto: Re: [arch-general] Can't see all my memory

On Fri, 2012-09-21 at 16:17 +0530, Aurko Roy wrote:

...
On Fri, Sep 21, 2012 at 4:16 PM, Roel Deckers wrote:

...
Does the missing memory show up in other OSs? It can be faulty ram if it doesn't show up in any OS, recently had that problem.

On Fri, Sep 21, 2012 at 12:37 PM, Guillermo Leira wrote:

...
Hello!

I've installed an x86_64 Arch on a PC with 8 GB, but it seems to be seeing just four. What have I done wrong?

Bios sees 4 x 2GB Modules and reports 8 GB, but top or free report only 4 GB.

...
You could try running memtest86+ on boot and see if it detects the additional memory.

I never heard that anybody solved this issue, but I read that many people have this issue too.

On my computer there are only 3 GB + 768 MB of 4 MB available. The graphics has got it's own framebuffer, 256 MB, but IIRC I once have seen that the framebuffer is 512 MB. I guess I can see it running NVIDIA settings, but at the moment I can't run it, because I'm using the nv driver. IIRC memtest86+ did always show the complete memory on my machine. I don't care, since it doesn't make a difference if I got 4GB or 3.8GB. However, I read often about this 8GB issue, for different distros. And it where definitive threads about 64-bit architecture, not about 32-bit and PAE issues.

Regards, Ralf

Well... Solved. It is a new motherboard, and it has a setting (that I've never seen in any other one) that says "Memory Remap Feature". I don't understand that a motherboard has a default option that actually should appear as "Waste half of your memory". Thanks to all. :-) Guillermo Leira

Dave Warren

9:18 p.m.

On 9/21/2012 11:55, Guillermo Leira wrote:

Well... Solved. It is a new motherboard, and it has a setting (that I've never seen in any other one) that says "Memory Remap Feature". I don't understand that a motherboard has a default option that actually should appear as "Waste half of your memory". Thanks to all. :-) Guillermo Leira

This generally enables better x86 compatibility, at the cost of x64 memory availability. -- Dave Warren http://www.hireahit.com/ http://ca.linkedin.com/in/davejwarren

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participants (7)

Aurko Roy
Dave Warren
Guillermo Leira
Kevin Chadwick
Ralf Mardorf
Roel Deckers
Victor Silva