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Date: Mon, 28 Apr 2003 17:11:59 +0200
From: Carl-Daniel Hailfinger <c-d.hailfinger.kernel.2003@gmx.net>
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To: Andi Kleen <ak@suse.de>
CC: Henti Smith <bain@tcsn.co.za>, linux-kernel@vger.kernel.org,
       lse-tech@lists.sourceforge.net
Subject: Re: [Lse-tech] Re: maximum possible memory limit ..
References: <20030424200524.5030a86b.bain@tcsn.co.za> <3EAD27B2.9010807@gmx.net> <20030428141023.GC4525@Wotan.suse.de>
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Andi Kleen wrote:
> > Linux supports up to 4 GB (~2^32 bytes) of memory on 32-bit
> > architectures and 64 GB (~2^36 bytes) on x86 with PAE. No other
> 
> 
> That's far too optimistic. 64GB will need patches, like the pgcl 
> patch. It is unlikely to work out of the box. Just do the math.

[explanatory math snipped]

> Realistic limit currently is ~16GB with an IA32 box.  For more you need

<marketingspeak>
This means ~16GB is available on IA32 right now with vanilla kernels,
and 64GB is available from vendors who are willing to apply the pgcl
patch. Conclusion: Linux supports 64GB on IA32
</marketingspeak>

> an 64bit architecture.

> > On 64-bit systems, Linux supports up to 16 EB (~2^64 bytes) of memory

That statement is OK?


Thanks,
Carl-Daniel
-- 
http://www.hailfinger.org/