Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755181AbZJKJLL (ORCPT ); Sun, 11 Oct 2009 05:11:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754573AbZJKJLI (ORCPT ); Sun, 11 Oct 2009 05:11:08 -0400 Received: from gate.crashing.org ([63.228.1.57]:35533 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754555AbZJKJLG (ORCPT ); Sun, 11 Oct 2009 05:11:06 -0400 Subject: Re: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why? From: Benjamin Herrenschmidt To: Linus Torvalds Cc: David Woodhouse , Jeff Chua , Valdis.Kletnieks@vt.edu, Tomasz Chmielewski , Daniel J Blueman , Byron Stanoszek , Dave Hansen , Hugh Dickins , Linux Kernel , Andrew Morton , Hugh Dickins In-Reply-To: References: <1254833974.14541.1306.camel@macbook.infradead.org> Content-Type: text/plain; charset="UTF-8" Date: Sun, 11 Oct 2009 20:08:53 +1100 Message-Id: <1255252133.2192.38.camel@pasglop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1104 Lines: 27 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/