From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756075AbXGINbO (ORCPT ); Mon, 9 Jul 2007 09:31:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757307AbXGINa6 (ORCPT ); Mon, 9 Jul 2007 09:30:58 -0400 Received: from fmmailgate09.web.de ([217.72.192.184]:50461 "EHLO fmmailgate09.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757309AbXGINa6 (ORCPT ); Mon, 9 Jul 2007 09:30:58 -0400 Date: Mon, 09 Jul 2007 15:30:56 +0200 Message-Id: <1986830882@web.de> MIME-Version: 1.0 From: elvis_the_king@web.de To: linux-kernel@vger.kernel.org Subject: x86 vs x86-64 IO-related performance questions Organization: http://freemail.web.de/ X-Provags-Id: V01U2FsdGVkX18G1tgyPbDkdQEf5jZolivXxArK45EZiFT/9eFZhMfTWsRPn ncGXO7iJx2gWiz5ZOsmPoFrmln5YqHjtTDaP7doAAjIoVux6R/F4MgXt4skB g== Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi all, two questions I simply cannot find answered. On a EM64T capable machine with > 4GB RAM: 1. Should using x86 vs. x86-64 make a difference for block device IO, because more data can be carried at a time? 2. I can use the RAM through PAE, but single processes are limited to a 4GB virtual address space. Now can the kernel itself use more than 4GB at once for the buffer cache? Thanks! Matthias _____________________________________________________________________ Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! http://smartsurfer.web.de/?mc=100071&distributionid=000000000066