Return-Path: Received: from Hermes.suse.de (Hermes.suse.de [10.10.96.4]) by Wotan.suse.de (Postfix) with ESMTP id 30FE185070 for ; Wed, 14 Nov 2001 14:47:23 +0100 (CET) Received: by Hermes.suse.de (Postfix) id 24BFB5D848; Wed, 14 Nov 2001 14:47:23 +0100 (MET) Received: from Cantor.suse.de (ns.suse.de [213.95.15.193]) by Hermes.suse.de (Postfix) with ESMTP id 112F95D843; Wed, 14 Nov 2001 14:47:23 +0100 (MET) Received: from vger.kernel.org (vger.kernel.org [199.183.24.194]) by Cantor.suse.de (Postfix) with ESMTP id D4DF51E439; Wed, 14 Nov 2001 14:47:22 +0100 (MET) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 14 Nov 2001 08:45:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 14 Nov 2001 08:45:13 -0500 Received: from smtpde02.sap-ag.de ([194.39.131.53]:40610 "EHLO smtpde02.sap-ag.de") by vger.kernel.org with ESMTP id ; Wed, 14 Nov 2001 08:45:01 -0500 Received: from sap-ag.de (smtpde02) by smtpde02.sap-ag.de (out) with ESMTP id OAA13016 for ; Wed, 14 Nov 2001 14:47:57 +0100 (MEZ) Message-ID: <3BF27557.30007@sap.com> Date: Wed, 14 Nov 2001 14:44:55 +0100 From: Willi =?ISO-8859-1?Q?N=FC=DFer?= Organization: SAP AG User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.5) Gecko/20011012 X-Accept-Language: en-us MIME-Version: 1.0 To: lkml Subject: Comparison of PAE and Non-PAE 2..4.14 (p8) in high load Content-Type: text/plain; charset=us-ascii; format=flowed X-SAP: out Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 7bit Hi, after my first posting to lkml where we compared distributor provided kernels vs. a plain 2.4.14-pre8 it was pointed out that between PAE and non-PAE kernels some performance differences might exist. We checked this last night and here are the first results. Again, a) the relevant quantity dialog steps per second is a measure for the throughput our application servers runs. b) our application server and the corresponding database (SAP DB) run on 4 way Dell, 1 GB at boot time enabled. Results: --------- 2.4.7 2.4.14p8 PAE 2.4.14p4 non- PAE ------------------------------------------------------------- 1.80 13.42 15.47 1.10 13.28 14.76 1.20 14.08 14.63 1.26 13.17 15.30 1.35 13.41 14.51 This means that we did see a performance decrease of about 6 % compared to 2.4.14p8 nonPAE but still 2.4.14p8 is an order of magnitude faster than 2.4.7 -- Best regards Willi ----------------------------------- Willi Nuesser SAP Linuxlab - 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/