From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755514Ab2I0H4B (ORCPT ); Thu, 27 Sep 2012 03:56:01 -0400 Received: from mailout-de.gmx.net ([213.165.64.22]:33429 "HELO mailout-de.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752550Ab2I0Hz7 (ORCPT ); Thu, 27 Sep 2012 03:55:59 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX19lNTAqkFVlpXA1UVQwyecTA8Tf8A9Hl6AoeFFCSG Ay3bQVJVKY0MJo Message-ID: <1348732552.7059.189.camel@marge.simpson.net> Subject: Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets - bisected From: Mike Galbraith To: david@lang.hm Cc: Borislav Petkov , Linus Torvalds , Peter Zijlstra , Mel Gorman , Nikolay Ulyanitsky , linux-kernel@vger.kernel.org, Andreas Herrmann , Andrew Morton , Thomas Gleixner , Ingo Molnar , Suresh Siddha Date: Thu, 27 Sep 2012 09:55:52 +0200 In-Reply-To: References: <20120924192056.GB4082@liondog.tnic> <1348538258.7100.23.camel@marge.simpson.net> <1348574286.3881.40.camel@twins> <20120925131736.GA30652@x1.osrc.amd.com> <20120925170058.GC30158@x1.osrc.amd.com> <20120926163233.GA5339@x1.osrc.amd.com> <20120926213723.GA27692@liondog.tnic> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2012-09-27 at 00:17 -0700, david@lang.hm wrote: > over the long term, the work lost due to not moving optimally right away > is probably much less than the work lost due to trying to figure out the > perfect thing to do. Yeah, "Perfect is the enemy of good" definitely applies. Once you're ramped, less is more. -Mike