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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Martin Steigerwald <ms@teamix.de>
Cc: linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: physical memory limit of 64-bit linux
Date: Tue, 16 Dec 2008 16:54:16 +0100	[thread overview]
Message-ID: <200812161654.17291.rjw@sisk.pl> (raw)
In-Reply-To: <200812161556.25518.ms@teamix.de>

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

  reply	other threads:[~2008-12-16 15:56 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-16 14:56 Martin Steigerwald
2008-12-16 15:54 ` Rafael J. Wysocki [this message]
2008-12-16 16:44   ` Andi Kleen
2008-12-17 14:12     ` Martin Steigerwald
2008-12-16 18:47   ` Ingo Molnar
2008-12-16 19:07     ` Jeremy Fitzhardinge
2008-12-16 19:23       ` Ingo Molnar
2008-12-16 19:28     ` Andi Kleen
2008-12-17 14:30     ` Martin Steigerwald

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