Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751950AbZIHT0N (ORCPT ); Tue, 8 Sep 2009 15:26:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751584AbZIHT0M (ORCPT ); Tue, 8 Sep 2009 15:26:12 -0400 Received: from srv5.dvmed.net ([207.36.208.214]:40426 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751213AbZIHT0L (ORCPT ); Tue, 8 Sep 2009 15:26:11 -0400 Message-ID: <4AA6AFCE.5080406@garzik.org> Date: Tue, 08 Sep 2009 15:26:06 -0400 From: Jeff Garzik User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3 MIME-Version: 1.0 To: Serge Belyshev CC: Jesse Brandeburg , Ingo Molnar , Con Kolivas , linux-kernel@vger.kernel.org, Peter Zijlstra , Mike Galbraith Subject: Re: Epic regression in throughput since v2.6.23 References: <20090906205952.GA6516@elte.hu> <87hbvdiogq.fsf@depni.sinp.msu.ru> <4807377b0909081047kfad088j694bd2b806075c5f@mail.gmail.com> <4AA6A9E8.9000407@garzik.org> <87ab15i6q4.fsf@depni.sinp.msu.ru> In-Reply-To: <87ab15i6q4.fsf@depni.sinp.msu.ru> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.4 (----) X-Spam-Report: SpamAssassin version 3.2.5 on srv5.dvmed.net summary: Content analysis details: (-4.4 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 721 Lines: 21 On 09/08/2009 03:20 PM, Serge Belyshev wrote: > Jeff Garzik writes: > >> You will almost certainly see idle CPUs/threads with "make -jN_CPUS" >> due to processes waiting for I/O. > > Just to clarify: I have excluded all I/O effects in my plots completely > by building completely from tmpfs. Also, before each actual measurment > there was a thrown-off "pre-caching" one. And my box has 8GB of RAM. You could always one-up that by using ramfs ;) Jeff -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/