linux-kernel - Re: 2.6.32-rc3: low mem - only 378MB on x86

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Date:	Sun, 11 Oct 2009 10:34:16 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Jeff Chua <jeff.chua.linux@...il.com>, Valdis.Kletnieks@...edu,
	Tomasz Chmielewski <mangoo@...g.org>,
	Daniel J Blueman <daniel.blueman@...il.com>,
	Byron Stanoszek <bstanoszek@...time.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why?



On Sun, 11 Oct 2009, Benjamin Herrenschmidt wrote:
> > 
> > It's supposed to be easier these days, but I guess distros don't compile 
> > in support for 64-bit mode by default. Just using another machine may be 
> > the simplest approach, if you have any 64-bit distro around.
> 
> My experience is that most distros have a compiler capable of generating
> a 64-bits kernel

At least not Fedora x86. Doing "gcc -m64" results in

	sorry, unimplemented: 64-bit mode not compiled in

on my laptop.

			Linus
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