Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751568Ab0AANic (ORCPT ); Fri, 1 Jan 2010 08:38:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751483Ab0AANic (ORCPT ); Fri, 1 Jan 2010 08:38:32 -0500 Received: from khc.piap.pl ([195.187.100.11]:37700 "EHLO khc.piap.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751475Ab0AANib (ORCPT ); Fri, 1 Jan 2010 08:38:31 -0500 From: Krzysztof Halasa To: Thanasis Cc: gentoo-user@lists.gentoo.org, Dirk Heinrichs , LKML Subject: Re: [gentoo-user] RAM installed vs reported References: <4B3B3043.20400@asyr.hopto.org> <200912301208.54359.dirk.heinrichs@online.de> <4B3B38F2.6090006@asyr.hopto.org> <4B3CF04E.8070603@asyr.hopto.org> Date: Fri, 01 Jan 2010 14:38:25 +0100 In-Reply-To: <4B3CF04E.8070603@asyr.hopto.org> (thanasis@asyr.hopto.org's message of "Thu, 31 Dec 2009 20:41:18 +0200") Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 998 Lines: 23 Thanasis writes: >> Depends on the "split" used. With 2 GB : 2 GB you can have all-lowmem >> 1.5 GB RAM, without CONFIG_HIGHMEM*. 2 GB of per-process address space >> is usually not a problem. > How do you implement that? What do you mean 2GB:2GB split ? See "make menuconfig", Processor type and features -> Memory split. You need to select "EMBEDDED" and "EXPERIMENTAL" first. What you need for 1.5 GB RAM is VMSPLIT_2G. The idea is that the CPU address space is divided: ca. 2 GB (in this configuration) for user space (for each process - instead of 3 GB), 2 GB - 128 MB (or something like that, I don't remember exactly) for physical RAM, and the last 128 MB or so for PCI devices and other things. -- Krzysztof Halasa -- 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/