Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751785AbZIHTUV (ORCPT ); Tue, 8 Sep 2009 15:20:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751284AbZIHTUU (ORCPT ); Tue, 8 Sep 2009 15:20:20 -0400 Received: from depni.sinp.msu.ru ([213.131.7.21]:52915 "EHLO depni.sinp.msu.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750934AbZIHTUT (ORCPT ); Tue, 8 Sep 2009 15:20:19 -0400 From: Serge Belyshev To: Jeff Garzik 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> Date: Tue, 08 Sep 2009 19:20:19 +0000 In-Reply-To: <4AA6A9E8.9000407@garzik.org> (Jeff Garzik's message of "Tue, 08 Sep 2009 15:00:56 -0400") Message-ID: <87ab15i6q4.fsf@depni.sinp.msu.ru> User-Agent: Gnus/5.13 (Gnus v5.13) 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 Content-Length: 605 Lines: 13 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. -- 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/