Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965163AbWIRAKL (ORCPT ); Sun, 17 Sep 2006 20:10:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965165AbWIRAKL (ORCPT ); Sun, 17 Sep 2006 20:10:11 -0400 Received: from mx1.redhat.com ([66.187.233.31]:56494 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S965163AbWIRAKK (ORCPT ); Sun, 17 Sep 2006 20:10:10 -0400 Message-ID: <450DE3DE.50301@redhat.com> Date: Sun, 17 Sep 2006 20:10:06 -0400 From: Rik van Riel Organization: Red Hat, Inc User-Agent: Thunderbird 1.5.0.4 (X11/20060614) MIME-Version: 1.0 To: yogeshwar sonawane CC: linux-kernel Subject: Re: How much kernel memory is in 64-bit OS ? References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 914 Lines: 26 yogeshwar sonawane wrote: > Hi all, > > We all know that in 32-bit OS, total 4GB memory space is divided in > 3(user) + 1(kernel) space. > > Similarly, what is the division/scenario in case of 64-bit OS ? It depends on the architecture. However, all 64 bit architectures have one thing in common. There is so much address space available for both kernel and userspace that we won't have to worry about a shortage for a very long time. Sure, people said that too when going from 16 bits to 32 bits, but that was only a factor 2^16 difference. This time it's the square of the previous difference. -- What is important? What you want to be true, or what is true? - 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/