From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx190.postini.com [74.125.245.190]) by kanga.kvack.org (Postfix) with SMTP id 1CBA66B006C for ; Mon, 19 Nov 2012 17:36:11 -0500 (EST) Received: by mail-ea0-f169.google.com with SMTP id a12so1729260eaa.14 for ; Mon, 19 Nov 2012 14:36:09 -0800 (PST) Date: Mon, 19 Nov 2012 23:36:04 +0100 From: Ingo Molnar Subject: Re: [PATCH 00/27] Latest numa/core release, v16 Message-ID: <20121119223604.GA13470@gmail.com> References: <1353291284-2998-1-git-send-email-mingo@kernel.org> <20121119162909.GL8218@suse.de> <20121119191339.GA11701@gmail.com> <20121119211804.GM8218@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20121119211804.GM8218@suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Peter Zijlstra , Paul Turner , Lee Schermerhorn , Christoph Lameter , Rik van Riel , Andrew Morton , Andrea Arcangeli , Linus Torvalds , Thomas Gleixner , Johannes Weiner , Hugh Dickins * Mel Gorman wrote: > Ok. > > In response to one of your later questions, I found that I had > in fact disabled THP without properly reporting it. [...] Hugepages is a must for most forms of NUMA/HPC. This alone questions the relevance of most of your prior numa/core testing results. I now have to strongly dispute your other conclusions as well. Just a look at 'perf top' output should have told you the story. Yet time and time again you readily reported bad 'schednuma' results for a slow 4K memory model that neither we nor other NUMA testers I talked to actually used, without stopping to look why that was so... [ I suspect that if such terabytes-of-data workloads are forced through such a slow 4K pages model then there's a bug or mis-tuning in our code that explains the level of additional slowdown you saw - we'll fix that. But you should know that behavior under the slow 4K model tells very little about the true scheduling and placement quality of the patches... ] Please report proper THP-enabled numbers before continuing. Thanks, Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org