max RAM support on CENTOS 4.3 (32 bits) ???

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mcclnx mcc

3 Apr 2007 3 Apr '07

1:57 p.m.

we have DELL 6800 server with 20GB RAM in it. We like to expand it to 64 GB. I checked Redhat web site and it say max memory is "Architecture & system dependent".

Does anyone know what is Max RAM Redhat CENTOS 4.3 (32 bits) support?

Thanks.

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William Warren

3 Apr 3 Apr

2:07 p.m.

4 gigs unless you use the hugemem kernel and the cpu has PAE enabled. H

mcclnx mcc wrote:

...

we have DELL 6800 server with 20GB RAM in it. We like to expand it to 64 GB. I checked Redhat web site and it say max memory is "Architecture & system dependent".

Does anyone know what is Max RAM Redhat CENTOS 4.3 (32 bits) support?

Thanks.

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Morten Torstensen

4:42 p.m.

William Warren wrote:

...

4 gigs unless you use the hugemem kernel and the cpu has PAE enabled. H

And PAE can address up to 64GB memory, but it is not considered efficient above about 20GB -- because it has to map memory down into the 4GB space and shuffle addresses round. You also need free space in the 4GB address range.

-- //Morten Torstensen //Email: morten@mortent.org //IM: Cartoon@jabber.no morten.torstensen@gmail.com And if it turns out that there is a God, I don't believe that he is evil. The worst that can be said is that he's an underachiever.

Antonio da Silva Martins Junior

8:10 p.m.

----- "William Warren" hescominsoon@emmanuelcomputerconsulting.com wrote:

...

4 gigs unless you use the hugemem kernel and the cpu has PAE enabled. H

Hi,

jumping in this thread, I have a glitch with CentOS 4.4 and on a 4Gb system.

it's a HP Proliant DL-380G4, take a look:

[shadow@Barcelona ~]$ uname -a Linux Barcelona.uem.br 2.6.9-42.0.10.ELsmp #1 SMP Tue Feb 27 09:40:21 EST 2007 x86_64 x86_64 x86_64 GNU/Linux [shadow@Barcelona ~]$ free total used free shared buffers cached Mem: 3980132 3520928 459204 0 349764 670916 -/+ buffers/cache: 2500248 1479884 Swap: 8385920 160 8385760 [shadow@Barcelona ~]$

and on a SuperMicro mobo (i586) with 4Gb we have:

[shadow@Sakhir ~]$ uname -a Linux Sakhir.uem.br 2.6.9-42.0.10.ELsmp #1 SMP Tue Feb 27 10:11:19 EST 2007 i686 i686 i386 GNU/Linux [shadow@Sakhir ~]$ free total used free shared buffers cached Mem: 4152000 4088104 63896 0 262452 1540648 -/+ buffers/cache: 2285004 1866996 Swap: 2104504 132 2104372

Well, a x86_64 install can't find the 4Gb and a i586 install can. Ok, it's on different hardware, but it shows that CentOS 4.4 can address the 4Gb withou problem. And we had SLES9 on the same DL-380 hardware and it shows the 4Gb RAM...

Somebody can point me a direction to my lost 150Mb ??

Thanks,

Antonio.

-- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Antonio S. Martins Jr. - Support Analist | "Only The Shadow Knows | | Universidade Estadual de Maringá - Brasil| what evil lurks in the | | NPD - Núcleo de Processamento de Dados | Heart of Men!" | | E-Mail: asmartins@uem.br / shadow@uem.br | !!! Linux User: 52392 !!! | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -- Esta mensagem foi verificada pelo sistema de antiv�rus e acredita-se estar livre de perigo.

R Lists06

8:19 p.m.

...

Antonio wrote: jumping in this thread, I have a glitch with CentOS 4.4 and on a 4Gb system. it's a HP Proliant DL-380G4, take a look:

[shadow@Barcelona ~]$ uname -a Linux Barcelona.uem.br 2.6.9-42.0.10.ELsmp #1 SMP Tue Feb 27 09:40:21 EST 2007 x86_64 x86_64 x86_64 GNU/Linux [shadow@Barcelona ~]$ free total used free shared buffers cached Mem: 3980132 3520928 459204 0 349764 670916 -/+ buffers/cache: 2500248 1479884 Swap: 8385920 160 8385760 [shadow@Barcelona ~]$

and on a SuperMicro mobo (i586) with 4Gb we have:

[shadow@Sakhir ~]$ uname -a Linux Sakhir.uem.br 2.6.9-42.0.10.ELsmp #1 SMP Tue Feb 27 10:11:19 EST 2007 i686 i686 i386 GNU/Linux [shadow@Sakhir ~]$ free total used free shared buffers cached Mem: 4152000 4088104 63896 0 262452 1540648 -/+ buffers/cache: 2285004 1866996 Swap: 2104504 132 2104372

Well, a x86_64 install can't find the 4Gb and a i586 install can. Ok, it's on different hardware, but it shows that CentOS 4.4 can address the 4Gb withou problem. And we had SLES9 on the same DL-380 hardware and it shows the 4Gb RAM...

Somebody can point me a direction to my lost 150Mb ??

Thanks, Antonio.

Antonio

It would appear to me that you would have a little variance based upon machine hardware and BIOS settings and such... yet that amount seems a tad large depending on the hardware etc correct?

- rh

-- Robert - Abba Communications http://www.abbacomm.net/

Antonio da Silva Martins Junior

8:46 p.m.

----- "R Lists06" lists06@abbacomm.net wrote:

...

...
Antonio wrote: jumping in this thread, I have a glitch with CentOS 4.4 and on a

4Gb

...
system. it's a HP Proliant DL-380G4, take a look:

[shadow@Barcelona ~]$ uname -a Linux Barcelona.uem.br 2.6.9-42.0.10.ELsmp #1 SMP Tue Feb 27

09:40:21 EST

...
2007 x86_64 x86_64 x86_64 GNU/Linux [shadow@Barcelona ~]$ free total used free shared buffers

cached

...
Mem: 3980132 3520928 459204 0 349764

670916

...
-/+ buffers/cache: 2500248 1479884 Swap: 8385920 160 8385760 [shadow@Barcelona ~]$

and on a SuperMicro mobo (i586) with 4Gb we have:

[shadow@Sakhir ~]$ uname -a Linux Sakhir.uem.br 2.6.9-42.0.10.ELsmp #1 SMP Tue Feb 27 10:11:19

EST

...
2007 i686 i686 i386 GNU/Linux [shadow@Sakhir ~]$ free total used free shared buffers

cached

...
Mem: 4152000 4088104 63896 0 262452

1540648

...
-/+ buffers/cache: 2285004 1866996 Swap: 2104504 132 2104372

Well, a x86_64 install can't find the 4Gb and a i586 install can.

Ok,

...
it's on different hardware, but it shows that CentOS 4.4 can address the

4Gb

...
withou problem. And we had SLES9 on the same DL-380 hardware and it shows the 4Gb

RAM...

...
Somebody can point me a direction to my lost 150Mb ??

Thanks, Antonio.

Antonio

It would appear to me that you would have a little variance based upon machine hardware and BIOS settings and such... yet that amount seems a tad large depending on the hardware etc correct?

Robert,

what makes me wonder is SLES9 on this same hardware shows the 4Gb RAM, and I already had installed all CentOS x86_64 pre-compiled kernels on this machine without success. This little memory (150Mb) can't impact my application but I'm always searching for it :)

thanks,

Antonio.

John R Pierce

2:58 p.m.

mcclnx mcc wrote:

...

we have DELL 6800 server with 20GB RAM in it. We like to expand it to 64 GB. I checked Redhat web site and it say max memory is "Architecture & system dependent".

Does anyone know what is Max RAM Redhat CENTOS 4.3 (32 bits) support?

I would -STRONGLY- suggest running x86_64 (64bit) on any system with over 8GB of ram if you truly want to be able to use it properly.

PAE has an absolute upper limit of 64GB, but the PCI bus and its devices need about 1GB of that. I seriously doubt a 32bit system would get any more mileage out of 64GB than 20GB ram due to the 4GB addressable address space, and the size of the resulting page tables.

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Antonio da Silva Martins Junior
John R Pierce
mcclnx mcc
Morten Torstensen
R Lists06
William Warren