Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751291AbWHNN0H (ORCPT ); Mon, 14 Aug 2006 09:26:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751311AbWHNN0G (ORCPT ); Mon, 14 Aug 2006 09:26:06 -0400 Received: from erik-slagter.demon.nl ([83.160.41.216]:23693 "EHLO artemis.slagter.name") by vger.kernel.org with ESMTP id S1751291AbWHNN0F (ORCPT ); Mon, 14 Aug 2006 09:26:05 -0400 Subject: Re: md mirror / ext3 / dual core performance strange phenomenon? From: Erik Slagter To: Keith Owens Cc: linux-kernel@vger.kernel.org In-Reply-To: <10837.1155561722@ocs10w.ocs.com.au> References: <10837.1155561722@ocs10w.ocs.com.au> Content-Type: multipart/signed; micalg=sha1; protocol="application/x-pkcs7-signature"; boundary="=-aQmYpfriDXLMtErifYBK" Date: Mon, 14 Aug 2006 15:26:03 +0200 Message-Id: <1155561963.7809.30.camel@skylla.slagter.name> Mime-Version: 1.0 X-Mailer: Evolution 2.6.2 (2.6.2-1.fc5.5) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4929 Lines: 83 --=-aQmYpfriDXLMtErifYBK Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On ma, 2006-08-14 at 23:22 +1000, Keith Owens wrote: > >BUT... starting from -j4 (and upwards) the compile time suddenly goes to > >3.5 minutes! >=20 > Nothing to do with the disks, it is a design flaw in the kernel build > system. If you want a useful parallel make using -j, set to 3, > 4 or 5 higher than the real number of parallel jobs that you want. The > exact value to add depends on which kernel tree you are building. See > http://marc.theaimsgroup.com/?l=3Dlinux-kernel&m=3D115553906404695&w=3D2 Okay, so it basically means I shouldn't worry here. 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