From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David S. Miller" Date: Sat, 28 Aug 2004 00:23:37 +0000 Subject: Re: page fault scalability patch final : i386 tested, x86_64 Message-Id: <20040827172337.638275c3.davem@davemloft.net> List-Id: References: <20040815165827.0c0c8844.davem@redhat.com> <20040815185644.24ecb247.davem@redhat.com> <20040816143903.GY11200@holomorphy.com> <20040827233602.GB1024@wotan.suse.de> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Christoph Lameter Cc: ak@suse.de, akpm@osdl.org, wli@holomorphy.com, davem@redhat.com, raybry@sgi.com, ak@muc.de, benh@kernel.crashing.org, manfred@colorfullife.com, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, vrajesh@umich.edu, hugh@veritas.com On Fri, 27 Aug 2004 17:19:11 -0700 (PDT) Christoph Lameter wrote: > That is still 2^(32+12) = 2^44 = 16TB. It's actually: 2 ^ (31 + PAGE_SHIFT) '31' because atomic_t is 'signed' and PAGE_SHIFT should be obvious. Christoph definitely has a point, this is even more virtual space than most of the 64-bit platforms even support. (Sparc64 is 2^43 and I believe ia64 is similar) and this limit actually mostly comes from the 3-level page table limits. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267890AbUH1AZn (ORCPT ); Fri, 27 Aug 2004 20:25:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267872AbUH1AZj (ORCPT ); Fri, 27 Aug 2004 20:25:39 -0400 Received: from adsl-63-197-226-105.dsl.snfc21.pacbell.net ([63.197.226.105]:26242 "EHLO cheetah.davemloft.net") by vger.kernel.org with ESMTP id S267890AbUH1AYY (ORCPT ); Fri, 27 Aug 2004 20:24:24 -0400 Date: Fri, 27 Aug 2004 17:23:37 -0700 From: "David S. Miller" To: Christoph Lameter Cc: ak@suse.de, akpm@osdl.org, wli@holomorphy.com, davem@redhat.com, raybry@sgi.com, ak@muc.de, benh@kernel.crashing.org, manfred@colorfullife.com, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, vrajesh@umich.edu, hugh@veritas.com Subject: Re: page fault scalability patch final : i386 tested, x86_64 support added Message-Id: <20040827172337.638275c3.davem@davemloft.net> In-Reply-To: References: <20040815165827.0c0c8844.davem@redhat.com> <20040815185644.24ecb247.davem@redhat.com> <20040816143903.GY11200@holomorphy.com> <20040827233602.GB1024@wotan.suse.de> X-Mailer: Sylpheed version 0.9.12 (GTK+ 1.2.10; sparc-unknown-linux-gnu) X-Face: "_;p5u5aPsO,_Vsx"^v-pEq09'CU4&Dc1$fQExov$62l60cgCc%FnIwD=.UF^a>?5'9Kn[;433QFVV9M..2eN.@4ZWPGbdi<=?[:T>y?SD(R*-3It"Vj:)"dP Mime-Version: 1.0 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 On Fri, 27 Aug 2004 17:19:11 -0700 (PDT) Christoph Lameter wrote: > That is still 2^(32+12) = 2^44 = 16TB. It's actually: 2 ^ (31 + PAGE_SHIFT) '31' because atomic_t is 'signed' and PAGE_SHIFT should be obvious. Christoph definitely has a point, this is even more virtual space than most of the 64-bit platforms even support. (Sparc64 is 2^43 and I believe ia64 is similar) and this limit actually mostly comes from the 3-level page table limits.