linux-kernel - Re: physical memory limit of 64-bit linux

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Date:	Tue, 16 Dec 2008 16:54:16 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Martin Steigerwald <ms@...mix.de>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: physical memory limit of 64-bit linux

On Tuesday, 16 of December 2008, Martin Steigerwald wrote:
> 
> Hi!
> 
> What is the physical memory limit for 64-bit Linux? I read about 40 bit 
> address bus for AMD Athlon X2 (1 TB) and 48 bit for Barcelona X4 (256 TB).
> 
> Is 64-bit linux able to use that amount - provided that one would manage to 
> build it into a machine? Or does it have a lower limit?
> 
> Looking into the Google crystal ball gives unclear pictures... I tend to 
> assume that Linux would handle it, but I am not sure.

IIRC, the current maximal virtual memory space size of the kernel on x86_64 is 2^46.

Thanks,
Rafael
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