From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 14 May 2001 21:04:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 14 May 2001 21:03:54 -0400 Received: from intranet.resilience.com ([209.245.157.33]:1265 "EHLO intranet.resilience.com") by vger.kernel.org with ESMTP id ; Mon, 14 May 2001 21:03:43 -0400 Message-ID: <3B008169.6A6F46E@resilience.com> Date: Mon, 14 May 2001 18:07:53 -0700 From: Jeff Golds X-Mailer: Mozilla 4.75 [en] (X11; U; Linux 2.4.4 i686) X-Accept-Language: en MIME-Version: 1.0 To: Rik van Riel CC: Wayne Whitney , linux-kernel@vger.kernel.org Subject: Re: 2.4.4 kernel reports wrong amount of physical memory In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Rik van Riel wrote: > > On Mon, 14 May 2001, Jeff Golds wrote: > > > Ahh, it's totally obvious. 1 GB option = 890 MB, 4 GB option = > > 4GB. Can I assume a linear relation and get 66.2 MB when I > > select the 64 MB option? > > Where did you get the mythical "1GB" option? > > Last I looked we had "off", "4GB" and "64GB" ;) > Good try, except: If you are compiling a kernel which will never run on a machine with more than 1 Gigabyte total physical RAM, answer "off" here (default choice and suitable for most users). This will result in a "3GB/1GB" split: 3GB are mapped so that each process sees a 3GB virtual memory space and the remaining part of the 4GB virtual memory space is used by the kernel to permanently map as much physical memory as possible. If the machine has between 1 and 4 Gigabytes physical RAM, then answer "4GB" here. 1 GB is not more than 1 GB so "off" is the correct choice, according to the docs. Oh I get it NOW. "Off" means the docs are just plain "off". -Jeff -- Jeff Golds jgolds@resilience.com