From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754510Ab2IUORo (ORCPT ); Fri, 21 Sep 2012 10:17:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38406 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752302Ab2IUORm (ORCPT ); Fri, 21 Sep 2012 10:17:42 -0400 From: Jeff Moyer To: Jagdish Motwani Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: performance degradation on kernel upgrade (due to commit ab0a9735e06914ce4d2a94ffa41497dbc142fe7f ) References: <505C700C.3010403@elitecore.com> X-PGP-KeyID: 1F78E1B4 X-PGP-CertKey: F6FE 280D 8293 F72C 65FD 5A58 1FF8 A7CA 1F78 E1B4 X-PCLoadLetter: What the f**k does that mean? Date: Fri, 21 Sep 2012 10:17:37 -0400 In-Reply-To: <505C700C.3010403@elitecore.com> (Jagdish Motwani's message of "Fri, 21 Sep 2012 19:17:56 +0530") Message-ID: User-Agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jagdish Motwani writes: > Recently i upgraded my kernel from 2.6.29.6 to 2.6.35.14. > > After upgrading i got very poor performance on my postgre database. [...] > Using git bisect, i got commit ab0a9735e06914ce4d2a94ffa41497dbc142fe7f > > Is it a behavior change or am i missing something? Are there any > workarounds for this? commit ab0a9735e06914ce4d2a94ffa41497dbc142fe7f Author: Christoph Hellwig Date: Thu Oct 29 14:14:04 2009 +0100 blkdev: flush disk cache on ->fsync This is a data integrity fix, and you really don't want to work around it. Cheers, Jeff