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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Allocating more than 890MB in the kernel?
Date: 19 Oct 2001 12:59:20 -0700
Organization: Transmeta Corporation, Santa Clara CA
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In-Reply-To: <Pine.LNX.4.30.0110191204210.21846-100000@hill.cs.ucr.edu> <3BD08207.7090807@interactivesi.com>
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Copyright: Copyright 2001 H. Peter Anvin - All Rights Reserved
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Followup to:  <3BD08207.7090807@interactivesi.com>
By author:    Timur Tabi <ttabi@interactivesi.com>
In newsgroup: linux.dev.kernel
> 
> > Isn't this solved by just recompiling the kernel with HIGHMEM support?
> 
> 
> I don't think so.  The Red Hat 7.1 kernel is compiled with "4GB" support, 
> which apparently is the same as HIGHMEM.  We see the 890MB kernel vmalloc 
> limit still.
> 

That's because you're running out of address space, not memory.
HIGHMEM doesn't do anything for the latter -- it can't.  You start
running into a lot of fundamental problems when your memory size gets
in the same (or higher) ballpark than your address space.

The best solution is go buy a 64-bit CPU.  There isn't much else you
can do about it.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
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