From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751208AbWCGNHQ (ORCPT ); Tue, 7 Mar 2006 08:07:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751428AbWCGNHQ (ORCPT ); Tue, 7 Mar 2006 08:07:16 -0500 Received: from zproxy.gmail.com ([64.233.162.196]:49893 "EHLO zproxy.gmail.com") by vger.kernel.org with ESMTP id S1751208AbWCGNHO convert rfc822-to-8bit (ORCPT ); Tue, 7 Mar 2006 08:07:14 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=n1F+L8UeJZrKWJW5/eNhedxsLAt2c83To7QYWr0mc3xLxUdOthfNXGO3KGp7vmqZmAhvZ4JSp/1Pii+8wqhVxmmLvUyQTOluIkNi3u0kbcROkq3+zqX8MwrTtwXz0RKsHF1rHIZEX2IFvmEn6x+pJcW0/KUFc52CXKBOFxFvWqU= Message-ID: <9a8748490603070507h48e2fe02qbf9da7956e794161@mail.gmail.com> Date: Tue, 7 Mar 2006 14:07:13 +0100 From: "Jesper Juhl" To: "Magnus Damm" Subject: Re: SMP and 101% cpu max? Cc: "Linux Kernel Mailing List" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 3/7/06, Magnus Damm wrote: > Hi guys, > > I'm doing some memory related hacking, and part of that is testing the > current behaviour of the Linux VM. This testing involves running some > simple tests (building the linux kernel is one of the tests) while > varying the amount of RAM available to the kernel. > > I've tested memory configurations of 64MB, 128MB and 256MB on a Dual > PIII machine. The tested kernel is 2.6.16-rc5, and user space is based > on debian-3.1. I run 5 tests per memory configuration, and the machine > is rebooted between each test. > > Problem: > > With 128MB and 256MB configurations, a majority of the tests never > make it over 101% CPU usage when I run "make -j 2 bzImage", building a > allnoconfig kernel. With 64MB memory, everything seems to be working > as expected. Also, running "make bzImage" works as expected too. > Hmm, I wonder if it's related to the problem I reported here : http://lkml.org/lkml/2006/2/28/219 Where I need to run make -j 5 or higher to load both cores of my Athlon X2. -- Jesper Juhl Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please http://www.expita.com/nomime.html