[CentOS] x86 uniprocessor 4GB memory

[Bruno Sousa]

Hi there,

It seems like the bios of this machine doesn't have any type of
configuration regarding the memory mapping.
I'm already using the kernel-hugemem , but the problem remains.
What else can be done?

By the way, if the machine had more than one cpu, the problem would remain?

Best regards,
Bruno Sousa

-----Mensagem original-----
De: centos-bounces at centos.org [mailto:centos-bounces at centos.org] Em nome de
James Pearson
Enviada: quinta-feira, 22 de Junho de 2006 15:54
Para: CentOS mailing list
Assunto: Re: [CentOS] x86 uniprocessor 4GB memory

Bruno Sousa wrote:
> Hi there, 
> 
> I'm currently using CentOS 4.3 (Server edition) in a HP DC 5100 with the
> IntelR 915GV chipset, powered by a PIV 3.0GHZ.
> 
> Now I'm facing a problem, with memory. 
> 
> I got myself 4GB of memory, the system bios detects it correctly, but in
> Linux can only see around 3.5gb memory. With the default kernel-smp (I use
> hyperthread) or with kernel-hugemem , I have the same results.
> 
> Is there any way to workaround this issue?

It is probably the 4Gb memory hole issue - various 'things' reserve 
memory below 4GB so hiding the real memory from the OS.

Your BIOS may have a mapping option to map some of this hidden real 
memory to above 4Gb - however, you need to use a hugemem kernel to 
access this memory.

James Pearson
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