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

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Date:	Sun, 11 Oct 2009 20:06:33 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.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 Tue, 2009-10-06 at 07:35 -0700, Linus Torvalds wrote:
> 
> On Tue, 6 Oct 2009, Jeff Chua wrote:
> > 
> > First, have to compile gcc so that it can compile 64 bit kernel. That's a
> > tough one!
> 
> 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, if not 64-bits userspace (the later depends on whether
the "other" bits such as libgcc, glibc, etc... are there for 64-bits,
which is also generally available, though optional).

I regulary compile 64-bit kernels with a 32-bit Ubuntu or Debian on i386

Cheers,
Ben.

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