From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754700AbXJ3LQc (ORCPT ); Tue, 30 Oct 2007 07:16:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751036AbXJ3LQY (ORCPT ); Tue, 30 Oct 2007 07:16:24 -0400 Received: from rv-out-0910.google.com ([209.85.198.189]:8669 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752160AbXJ3LQX (ORCPT ); Tue, 30 Oct 2007 07:16:23 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=hsBD2CDWfeA7Av7QYwydjbAzj23im2QAZxZLjFl+OaARNhRbaFGh2aPJCSwbC/BjGtEWUWOwf70dExvMDTUlUHGdiJ77RJg28IOv9qPeEYlD/CnYOhSWxBJdpgxbkmX12Ekpe7QdRcg5IrPg4VOVDijG4VtddHz6+qKNinZmf8E= Message-ID: <252f133e0710300416x7490aeq4f371550fdf59b92@mail.gmail.com> Date: Tue, 30 Oct 2007 07:16:20 -0400 From: "=?ISO-8859-1?Q?Bj=F6rn?=" To: linux-kernel@vger.kernel.org Subject: Huge performance regression in 2.6.23? MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Have a look at slides 17, 18, and 19 of the presentation available at http://people.freebsd.org/~kris/scaling/7.0%20Preview.pdf . It shows a huge drop in performance for both PostgreSQL and MySQL under 2.6.23. The slides are light on details on the exact setup, but I find it hard to believe that such a major regression would have gone unnoticed during testing of CFS. Maybe someone (with the appropriate hardware, which I lack) can try to reproduce the results? Is it really that bad? - Bjoern