From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8347 invoked by alias); 19 May 2006 09:12:13 -0000 Received: (qmail 8338 invoked by uid 22791); 19 May 2006 09:12:12 -0000 X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (66.187.233.31) by sourceware.org (qpsmtpd/0.31) with ESMTP; Fri, 19 May 2006 09:12:10 +0000 Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com [172.16.52.254]) by mx1.redhat.com (8.12.11.20060308/8.12.11) with ESMTP id k4J9C83N022056; Fri, 19 May 2006 05:12:08 -0400 Received: from pobox.surrey.redhat.com (pobox.surrey.redhat.com [172.16.10.17]) by int-mx1.corp.redhat.com (8.12.11.20060308/8.12.11) with ESMTP id k4J9C7IA006115; Fri, 19 May 2006 05:12:08 -0400 Received: from [10.32.68.4] (vpn-68-4.surrey.redhat.com [10.32.68.4]) by pobox.surrey.redhat.com (8.12.11.20060308/8.12.11) with ESMTP id k4J9C6RT005699; Fri, 19 May 2006 10:12:06 +0100 Message-ID: <446D8BE1.3030504@redhat.com> Date: Fri, 19 May 2006 12:39:00 -0000 From: Nick Clifton User-Agent: Thunderbird 1.5 (X11/20051201) MIME-Version: 1.0 To: "H. J. Lu" CC: binutils@sources.redhat.com, discuss@x86-64.org Subject: Re: RFC: Change x86-64 maximum page size to 2MB References: <20060516232326.GA18996@lucon.org> In-Reply-To: <20060516232326.GA18996@lucon.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact binutils-help@sourceware.org; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: binutils-owner@sourceware.org X-SW-Source: 2006-05/txt/msg00327.txt.bz2 Hi H. J. > The current x86-64 maximum page size is 1MB. With the future > development, 2MB is better for performance. Using 2MB won't break > anything, except for up to 2MB gap in virtual address space per file, > instead of 1MB. x86-64 has 48 bits in virtual address space. It > shouldn't be an issue for most applications. I have a patch: > > http://sourceware.org/ml/binutils/2005-05/msg00644.html > > which can be used to implement "-z max-page-size=xxxx" so that people > can control maximum page size at the link time if they prefer different > maximum page size. This seems to be perfectly reasonable. Cheers Nick