FAQ Search Today's Posts Mark Forums Read
» Video Reviews

» Linux Archive

Linux-archive is a website aiming to archive linux email lists and to make them easily accessible for linux users/developers.


» Sponsor

» Partners

» Sponsor

Go Back   Linux Archive > Redhat > Fedora User

 
 
LinkBack Thread Tools
 
Old 07-16-2012, 12:16 AM
Reindl Harald
 
Default Memory on new computer

Am 16.07.2012 02:14, schrieb Martín Marqués:
> I had a problem with my main board and CPU and had to buy a new one.
> Also memory, as the old computer had DDR2 memory.
>
> Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank
> put in the Motherboard (the motherboard says it can handle up to 32Gb
> or ram).

sounds like you installed i686 instead x86_64
32bit OS is bad for modern computers

--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 
Old 07-16-2012, 12:33 AM
Thomas Cameron
 
Default Memory on new computer

On 07/15/2012 07:14 PM, Martín Marqués wrote:

I had a problem with my main board and CPU and had to buy a new one.
Also memory, as the old computer had DDR2 memory.

Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank
put in the Motherboard (the motherboard says it can handle up to 32Gb
or ram).

I saw this in dmesg:

[ 0.000000] Memory: 3491896k/4702208k available (6177k kernel code,
1053240k absent, 157072k reserved, 7004k data, 1004k init)

Why do I get this:

$ free
total used free shared buffers cached
Mem: 3513412 2591976 921436 0 8332 914584
-/+ buffers/cache: 1669060 1844352
Swap: 0 0 0





http://www.linuxquestions.org/questions/linux-hardware-18/linux-kernel-doesnt-see-all-my-ram-923078/
--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 
Old 07-16-2012, 11:55 AM
Paweł Brodacki
 
Default Memory on new computer

2012/7/16 MartÃ*n Marqués <martin.marques@gmail.com>:
> I had a problem with my main board and CPU and had to buy a new one.
> Also memory, as the old computer had DDR2 memory.
>
> Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank
> put in the Motherboard (the motherboard says it can handle up to 32Gb
> or ram).
>
> I saw this in dmesg:
>
> [ 0.000000] Memory: 3491896k/4702208k available (6177k kernel code,
> 1053240k absent, 157072k reserved, 7004k data, 1004k init)
>
> Why do I get this:
>
> $ free
> total used free shared buffers cached
> Mem: 3513412 2591976 921436 0 8332 914584
> -/+ buffers/cache: 1669060 1844352
> Swap: 0 0 0
>

There are several possible factors:
1) Integrated video card, which uses system memory.
2) Peripheral devices I/O regions are mapped below 4 GB, shadowing the
physical ram.

Here is (old, but still valid) explanation given by IBM for their
servers: https://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-4E4RRF
and here's the same issue addressed by Microsoft:
http://support.microsoft.com/kb/978610
I did not manage to find Red Hat's take on the issue.

In short: Works as designed. You may try to disable devices you do not
use to salvage some address space, but you won't reach 4096 MB
available.

>
> --
> MartÃ*n Marqués
> select 'martin.marques' || '@' || 'gmail.com'
> DBA, Programador, Administrador
> --
> users mailing list
> users@lists.fedoraproject.org
> To unsubscribe or change subscription options:
> https://admin.fedoraproject.org/mailman/listinfo/users
> Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
> Have a question? Ask away: http://ask.fedoraproject.org
--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 
Old 07-16-2012, 03:28 PM
Joachim Backes
 
Default Memory on new computer

On 07/16/2012 02:16 AM, Reindl Harald wrote:



Am 16.07.2012 02:14, schrieb Martín Marqués:

I had a problem with my main board and CPU and had to buy a new one.
Also memory, as the old computer had DDR2 memory.

Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank
put in the Motherboard (the motherboard says it can handle up to 32Gb
or ram).


sounds like you installed i686 instead x86_64


Hi Harald,

are you sure? I have the same problem with an ASROCK board (Conroe
DVI/H): 4 GB mem installed (2x2GB bars), and only 3.34 G available.


And: I'm running *F17/x86_64*.

> 32bit OS is bad for modern computers

Kind regards

Joachim Backes

--
Joachim Backes <joachim.backes@rhrk.uni-kl.de>

https://www-user.rhrk.uni-kl.de/~backes



--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 
Old 07-16-2012, 03:32 PM
Alan Cox
 
Default Memory on new computer

On Mon, 16 Jul 2012 02:16:01 +0200
Reindl Harald <h.reindl@thelounge.net> wrote:

>
>
> Am 16.07.2012 02:14, schrieb Martín Marqués:
> > I had a problem with my main board and CPU and had to buy a new one.
> > Also memory, as the old computer had DDR2 memory.
> >
> > Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank
> > put in the Motherboard (the motherboard says it can handle up to 32Gb
> > or ram).
>
> sounds like you installed i686 instead x86_64

A 32bit kernel can still handle more than 4GB of RAM on most processors
as they have page address extensions. That depends on the build options.

More likely perhaps some hardware doesn't support remapping so it cannot
move the other 0.5GB above the 4GB boundary to leave space for PCI etc,
so just loses it.

Alan
--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 
Old 07-16-2012, 03:37 PM
Mark Haney
 
Default Memory on new computer

On 07/16/2012 11:28 AM, Joachim Backes wrote:



are you sure? I have the same problem with an ASROCK board (Conroe
DVI/H): 4 GB mem installed (2x2GB bars), and only 3.34 G available.

And: I'm running *F17/x86_64*.

> 32bit OS is bad for modern computers

Kind regards

Joachim Backes





I don't have that problem and I run an ASRock board with 2x2GB bars and
I see all 4GB on mine. And yes it is x86_64.



--

Mark Haney
Software Developer/Consultant
AB Emblem
markh@abemblem.com
Linux marius.homelinux 3.4.4-4.fc16.x86_64 GNU/Linux


--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 
Old 07-16-2012, 04:36 PM
Martín Marqués
 
Default Memory on new computer

2012/7/15 Reindl Harald <h.reindl@thelounge.net>:
>
>
> Am 16.07.2012 02:14, schrieb Martín Marqués:
>> I had a problem with my main board and CPU and had to buy a new one.
>> Also memory, as the old computer had DDR2 memory.
>>
>> Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank
>> put in the Motherboard (the motherboard says it can handle up to 32Gb
>> or ram).
>
> sounds like you installed i686 instead x86_64
> 32bit OS is bad for modern computers

$ uname -a
Linux endor.marques 3.4.4-4.fc16.x86_64 #1 SMP Thu Jul 5 20:01:38 UTC
2012 x86_64 x86_64 x86_64 GNU/Linux

--
Martín Marqués
select 'martin.marques' || '@' || 'gmail.com'
DBA, Programador, Administrador
--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 
Old 07-16-2012, 04:44 PM
Martín Marqués
 
Default Memory on new computer

2012/7/16 Paweł Brodacki <pawel.brodacki@gmail.com>:
> 2012/7/16 MartÃ*n Marqués <martin.marques@gmail.com>:
>> I had a problem with my main board and CPU and had to buy a new one.
>> Also memory, as the old computer had DDR2 memory.
>>
>> Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank
>> put in the Motherboard (the motherboard says it can handle up to 32Gb
>> or ram).
>>
>> I saw this in dmesg:
>>
>> [ 0.000000] Memory: 3491896k/4702208k available (6177k kernel code,
>> 1053240k absent, 157072k reserved, 7004k data, 1004k init)
>>
>> Why do I get this:
>>
>> $ free
>> total used free shared buffers cached
>> Mem: 3513412 2591976 921436 0 8332 914584
>> -/+ buffers/cache: 1669060 1844352
>> Swap: 0 0 0
>>
>
> There are several possible factors:
> 1) Integrated video card, which uses system memory.
> 2) Peripheral devices I/O regions are mapped below 4 GB, shadowing the
> physical ram.

Could it be that the Motherboard uses normal ram for the integrated
ati video device? There are 500Mb of video memory. Does it use normal
RAM? Are does the 500Mb less I have?

$ lspci -vv
00:00.0 Host bridge: Advanced Micro Devices [AMD] Family 12h Processor
Root Complex
Subsystem: ASUSTeK Computer Inc. Device 84c8
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0

00:01.0 VGA compatible controller: ATI Technologies Inc Device 9645
(prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. Device 84c8
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 42
Region 0: Memory at c0000000 (32-bit, prefetchable) [size=256M]
Region 1: I/O ports at f000 [size=256]
Region 2: Memory at fef00000 (32-bit, non-prefetchable) [size=256K]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: radeon
Kernel modules: radeon


> Here is (old, but still valid) explanation given by IBM for their
> servers: https://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-4E4RRF
> and here's the same issue addressed by Microsoft:
> http://support.microsoft.com/kb/978610
> I did not manage to find Red Hat's take on the issue.

I now about this. I had, 6 years ago an intel board which mapped
memory below the 4Gb so I had about 800Mb less. I was really
disappointed with intel, as it had no fix, so I decided to never by an
intel product ever.

> In short: Works as designed. You may try to disable devices you do not
> use to salvage some address space, but you won't reach 4096 MB
> available.

As I said, if that's the design, I will just look for another provider
of Motherboards and ditch ASUS with Intel.

--
MartÃ*n Marqués
select 'martin.marques' || '@' || 'gmail.com'
DBA, Programador, Administrador
--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 
Old 07-16-2012, 06:42 PM
Paweł Brodacki
 
Default Memory on new computer

2012/7/16 MartÃ*n Marqués <martin.marques@gmail.com>:
> 2012/7/16 Paweł Brodacki <pawel.brodacki@gmail.com>:
>> 2012/7/16 MartÃ*n Marqués <martin.marques@gmail.com>:
>>> I had a problem with my main board and CPU and had to buy a new one.
>>> Also memory, as the old computer had DDR2 memory.
>>>
>>> Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank
>>> put in the Motherboard (the motherboard says it can handle up to 32Gb
>>> or ram).
>>>
>>> I saw this in dmesg:
>>>
>>> [ 0.000000] Memory: 3491896k/4702208k available (6177k kernel code,
>>> 1053240k absent, 157072k reserved, 7004k data, 1004k init)
>>>
>>> Why do I get this:
>>>
>>> $ free
>>> total used free shared buffers cached
>>> Mem: 3513412 2591976 921436 0 8332 914584
>>> -/+ buffers/cache: 1669060 1844352
>>> Swap: 0 0 0
>>>
>>
>> There are several possible factors:
>> 1) Integrated video card, which uses system memory.
>> 2) Peripheral devices I/O regions are mapped below 4 GB, shadowing the
>> physical ram.
>
> Could it be that the Motherboard uses normal ram for the integrated
> ati video device? There are 500Mb of video memory. Does it use normal
> RAM? Are does the 500Mb less I have?
>
> $ lspci -vv
> 00:00.0 Host bridge: Advanced Micro Devices [AMD] Family 12h Processor
> Root Complex
> Subsystem: ASUSTeK Computer Inc. Device 84c8
> Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
> ParErr- Stepping- SERR- FastB2B- DisINTx-
> Status: Cap- 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium
>>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> Latency: 0
>
> 00:01.0 VGA compatible controller: ATI Technologies Inc Device 9645
> (prog-if 00 [VGA controller])
> Subsystem: ASUSTeK Computer Inc. Device 84c8
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
> ParErr- Stepping- SERR- FastB2B- DisINTx+
> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort- >SERR- <PERR- INTx-
> Latency: 0, Cache Line Size: 64 bytes
> Interrupt: pin A routed to IRQ 42
> Region 0: Memory at c0000000 (32-bit, prefetchable) [size=256M]
> Region 1: I/O ports at f000 [size=256]
> Region 2: Memory at fef00000 (32-bit, non-prefetchable) [size=256K]
> Expansion ROM at <unassigned> [disabled]
> Capabilities: <access denied>
> Kernel driver in use: radeon
> Kernel modules: radeon
>

I'm not an expert on reading lspci output, but ATI Device 9645 seems
to be the graphics engine in AMD A4 APUs. If it indeed is, then part
of system memory is used as graphics buffer. size=256M seems to
suggest that it has 256 MB allocated. Therefore, it might be
responsible for a large chunk of that missing 512 MB.

>
>> Here is (old, but still valid) explanation given by IBM for their
>> servers: https://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-4E4RRF
>> and here's the same issue addressed by Microsoft:
>> http://support.microsoft.com/kb/978610
>> I did not manage to find Red Hat's take on the issue.
>
> I now about this. I had, 6 years ago an intel board which mapped
> memory below the 4Gb so I had about 800Mb less. I was really
> disappointed with intel, as it had no fix, so I decided to never by an
> intel product ever.
>
>> In short: Works as designed. You may try to disable devices you do not
>> use to salvage some address space, but you won't reach 4096 MB
>> available.
>
> As I said, if that's the design, I will just look for another provider
> of Motherboards and ditch ASUS with Intel.
>

Seems that Asus has a bad day, as I just recently been bitten by the
PCI bridge bug on their Asus E45M1-M PRO board. I had better luck with
Gigabyte.

> --
> MartÃ*n Marqués
> select 'martin.marques' || '@' || 'gmail.com'
> DBA, Programador, Administrador
> --
> users mailing list
> users@lists.fedoraproject.org
> To unsubscribe or change subscription options:
> https://admin.fedoraproject.org/mailman/listinfo/users
> Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
> Have a question? Ask away: http://ask.fedoraproject.org
--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 
Old 07-16-2012, 07:28 PM
jdow
 
Default Memory on new computer

On 2012/07/16 04:55, Paweł Brodacki wrote:

2012/7/16 MartÃ*n Marqués <martin.marques@gmail.com>:

I had a problem with my main board and CPU and had to buy a new one.
Also memory, as the old computer had DDR2 memory.

Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank
put in the Motherboard (the motherboard says it can handle up to 32Gb
or ram).

I saw this in dmesg:

[ 0.000000] Memory: 3491896k/4702208k available (6177k kernel code,
1053240k absent, 157072k reserved, 7004k data, 1004k init)

Why do I get this:

$ free
total used free shared buffers cached
Mem: 3513412 2591976 921436 0 8332 914584
-/+ buffers/cache: 1669060 1844352
Swap: 0 0 0



There are several possible factors:
1) Integrated video card, which uses system memory.
2) Peripheral devices I/O regions are mapped below 4 GB, shadowing the
physical ram.

Here is (old, but still valid) explanation given by IBM for their
servers: https://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-4E4RRF
and here's the same issue addressed by Microsoft:
http://support.microsoft.com/kb/978610
I did not manage to find Red Hat's take on the issue.

In short: Works as designed. You may try to disable devices you do not
use to salvage some address space, but you won't reach 4096 MB
available.


This is well known issue. The missing space is occupied by the page table
index. When pages are 4k in size you need a lot of table entries to describe
a full 4 gigabytes, like a million of them. Linux seems to have optimized
this a little. Windows loses a bit more memory, if I recall correctly.

{^_^}
--
users mailing list
users@lists.fedoraproject.org
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
 

Thread Tools




All times are GMT. The time now is 06:54 AM.

VBulletin, Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2007, Crawlability, Inc.
Copyright ©2007 - 2008, www.linux-archive.org