Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760302AbYCZLQP (ORCPT ); Wed, 26 Mar 2008 07:16:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754912AbYCZLQA (ORCPT ); Wed, 26 Mar 2008 07:16:00 -0400 Received: from fg-out-1718.google.com ([72.14.220.152]:18551 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753556AbYCZLP7 convert rfc822-to-8bit (ORCPT ); Wed, 26 Mar 2008 07:15:59 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=G6FZjnioYWpG4gfMaVKObwo5YF0sKBJUcaWDxTfQIz8nbzuiUnEJaZIjFtFRkfPWg7q0wa2DKF7V6ww9no0bBLKmLoqXcwZ8zCG0Y6scZkKZUpIkpZRL6V/DibNoHOFfOe5DdGvWadjg2VMzPimEvOuX2gzfytARiVpufsy6xHA= Message-ID: Date: Wed, 26 Mar 2008 12:15:57 +0100 From: "Bart Van Assche" To: "Emmanuel Florac" Subject: Re: RAID-1 performance under 2.4 and 2.6 Cc: linux-kernel@vger.kernel.org In-Reply-To: <20080326120713.24cb8093@harpe.intellique.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Content-Disposition: inline References: <20080325194306.4ac71ff2@galadriel.home> <20080326120713.24cb8093@harpe.intellique.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 955 Lines: 22 On Wed, Mar 26, 2008 at 12:07 PM, Emmanuel Florac wrote: > Le Wed, 26 Mar 2008 09:42:19 +0100 > "Bart Van Assche" ?crivait: > > > Keep in mind that the above test tests two subsystems at the same > > time: RAID-1 + the filesystem on top of it. > > I'm using XFS usually, and I've also checked against the raw devices > and it looks the same (2.4 still faster). I must add that the difference > is somewhat reduced when using a single disk drive vs. RAID-1, > obviously due to different buffering policy in the RAID subsystem. You are welcome to post the numbers you obtained with dd for direct I/O on a RAID-1 setup for 2.4 versus 2.6 kernel. Bart. -- 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/