From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932579AbWB1UsP (ORCPT ); Tue, 28 Feb 2006 15:48:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932584AbWB1UsP (ORCPT ); Tue, 28 Feb 2006 15:48:15 -0500 Received: from zproxy.gmail.com ([64.233.162.202]:11379 "EHLO zproxy.gmail.com") by vger.kernel.org with ESMTP id S932579AbWB1UsN convert rfc822-to-8bit (ORCPT ); Tue, 28 Feb 2006 15:48:13 -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=nzm/yw/2Sede1DcANIuvZK2vanNIT5cGGR/oU14zGccx3qkNFyxQERo5F07TRdms4dUvzKlUxqz5z5hZkGXY/siBujOUqYXdjVquK6jbdR28b4IRW2zO/nNqCKBQd5oYwOCbD3q5G9aPCh/9/rHSUAYFGY3bhj1/EVQooJJ7fiI= Message-ID: <9a8748490602281248p6877478sa17f25dafe019d4e@mail.gmail.com> Date: Tue, 28 Feb 2006 21:48:12 +0100 From: "Jesper Juhl" To: Christian Subject: Re: Odd sched behaviour; It takes 5 threads or more to load 2 CPU cores during kernel build Cc: linux-kernel@vger.kernel.org In-Reply-To: <200602282121.11863.christiand59@web.de> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: <9a8748490602281159u58df3397g1b6b268787146448@mail.gmail.com> <200602282121.11863.christiand59@web.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 2/28/06, Christian wrote: > Am Dienstag, 28. Februar 2006 20:59 schrieb Jesper Juhl: [snip] > > > > Do we have a scheduler problem? > > An io-scheduler problem? > > I'm not really into this, but what happens if you simply start 5 different > kernel-builds in parallel? I think if it makes a difference then this would > mean that there's something wrong with make and you could eliminate the first > two possibilities?! > Well, no need for 5 kernel builds in that case. If I clone my source tree and then simply run $ make distclean ; make allnoconfig ; nice make in each directory in two different shells at the same time, then both cores get fully loaded. > > Is it "make" that's being difficult? > > Is it something in the kernels Makefile that causes the build to > > behave this way? > > Could it be a bottleneck in my system somewhere? > > > > Anyone got a clue? > > -- 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