From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <20020102222026.69416.qmail@web12304.mail.yahoo.com> Date: Wed, 2 Jan 2002 14:20:26 -0800 (PST) From: Ravi K Subject: Maximum physical memory on i386 platform MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org Return-Path: To: kernelnewbies@nl.linux.org Cc: linux-mm@kvack.org List-ID: Hi, The configuration help for HIGHMEM feature on i386 platform states that 'Linux can use up to 64 Gigabytes of physical memory on x86 systems'. I see a problem with this: - page structures needed to support 64GB would take up 1GB memory (64 bytes per page of size 4k) - but the kernel can only use 896MB memory, unless PAGE_OFFSET is changed to a lower value - enabling 64GB support does not automatically change the value of PAGE_OFFSET So how are the page structures created if a machine has 64GB memory? Or is it necessary to change PAGE_OFFSET (to 0x80000000) in such a configuration? Thanks, Ravi. __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/