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

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Date:	Sun, 11 Oct 2009 20:08:53 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	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 07:26 -0700, Linus Torvalds wrote:

> The Intel Xorg guys used to do everything in 32-bit kernels because they 
> were also testing that they didn't break compatibility (which is a big 
> deal with that whole crazy DRM-in-kernel/direct-rendering-in-user-space 
> thing) and seemingly didn't realize that the compat layer was _supposed_ 
> to mean that they could run a 64-bit kernel and still have a working 
> 32-bit land.
> 
> It's driver interfaces like that that tend to break. ioctl's etc. But I 
> have heard less noise about it lately, so I do think it's mostly working.

I'm running a 32-bit Ubuntu karmic distro with a 64-bit kernel on my
thinkpad and so far, I yet have to encounter a single obvious problem
due to the compat layer. Everything seems to work fine including 3D,
compiz fancyness in X etc... :-)

Cheers,
Ben.



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