Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754258AbZKSVNP (ORCPT ); Thu, 19 Nov 2009 16:13:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752752AbZKSVNO (ORCPT ); Thu, 19 Nov 2009 16:13:14 -0500 Received: from mail-pz0-f171.google.com ([209.85.222.171]:45157 "EHLO mail-pz0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752697AbZKSVNN (ORCPT ); Thu, 19 Nov 2009 16:13:13 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=ko1ItRM7hDnTwNg6a1c9hjioCtIwL9czBIWvFID1hR06Swz6t/rY0MYPSUY6ZXh+r3 1FcbFg7ZhxMZAGwhJ7waJm5FNQK5kK4LC1tJE/vj9BambUCaD2po7MjPY8Pli0eYijGG Hk9dc7EIVvHJEHuf74YKSGldAzo3hMLmNw/NY= MIME-Version: 1.0 Date: Thu, 19 Nov 2009 13:13:19 -0800 Message-ID: <90f56e480911191313n1050831ft4369ab5fcb937c01@mail.gmail.com> Subject: Lmbench performance drop 2.6.18-->2.6.27 From: Ajay Patel To: linux-kernel Content-Type: multipart/mixed; boundary=00504502b67221233e0478bfd480 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 12617 Lines: 186 --00504502b67221233e0478bfd480 Content-Type: text/plain; charset=ISO-8859-1 Hi all, Part of our evaluation to upgrade kernel we ran lmbench. The lmbench results shows significant performance drop from 2.6.18 to 2.6.27. (Results attached) The benchmark was performed on same hardware with different distro. (Quad-Core AMD Opteron(tm) Processor 2346 HE, cpu MHz : 1795.597, cache size : 512 KB, x86_64 kernel) The 2.6.18 based distribution was from CentOS release 5.4. (Linux cento-5.4 2.6.18-164.el5). The 2.6.27 based distribution was from FC10. (Fedora Core release 10 2.6.27.5-117.fc10-x86_64). Does this results make sense? Is this expected? Am I doing something wrong? 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