Message-ID: <3174569B9743D511922F00A0C943142308085826@TYANWEB>
From: YhLu <YhLu@tyan.com>
To: Andi Kleen <ak@muc.de>
Cc: linux-kernel@vger.kernel.org
Subject: RE: X86_64 kernel support MAX memory.
Date: Tue, 15 Feb 2005 10:49:05 -0800
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Sender: linux-kernel-owner@vger.kernel.org
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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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