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SubjectRE: X86_64 kernel support MAX memory.
Date
I got a system with 8 way Opteron. Every CPU has 16G memory.

2.6 kernel x86_64, it will crash when it start the Fifth node.

YH

> -----Original Message-----
> From: Andi Kleen [mailto:ak@muc.de]
> Sent: Tuesday, February 15, 2005 4:08 AM
> To: YhLu
> Cc: linux-kernel@vger.kernel.org
> Subject: Re: X86_64 kernel support MAX memory.
>
> On Mon, Feb 14, 2005 at 07:32:42PM -0800, YhLu wrote:
> > Andi,
> >
> > How much is max RAM 2.6.11 x86_64 support on AMD64?
> > 64G or 128G?
>
> 46bits in theory (64TB), however current CPUs only support
> upto 40bits (AMD) or 36bits (Intel). There is some other
> code that is also limited to 40bits right now like AGP or
> IOMMU or MTRR, that is all due to hardware limitations.
>
> -Andi
>
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