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From: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
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To: William Lee Irwin III <wli@holomorphy.com>,
        "Martin J. Bligh" <Martin.Bligh@us.ibm.com>
Subject: Re: Can linux support ccNUMA machine now?
Date: Thu, 24 Jan 2002 14:15:30 -0200
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Cc: Barry Wu <wqb123@yahoo.com>, linux-kernel@vger.kernel.org
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> With some simple calculations for various things, I predict ZONE_NORMAL
> will get filled by large boot-time allocations on x86 with PAE and 64GB
> of RAM. I'm not entirely sure what other sorts of pathologies arise
> while these beasts still function; but without enough ZONE_NORMAL to
> satisfy all the combined boot-time allocation requests, the kernel
> will surely panic.
...
> P.S.: Blame it on struct page.

Looks like running x86 with more than 16GB RAM is not a good idea.
If you need it, you need 64bit arch.

This limit can be raised substantially by reducing low 4GB memory 
requirements, but don't you feel it's like running 16-bit DOS
on 686 class CPU? HIMEM.SYS, EMM, horde of DOS extenders - sounds familiar?

However, CPU vendors war over common 64-bit arch is still ahead...
--
vda
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