From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757411AbXFML4v (ORCPT ); Wed, 13 Jun 2007 07:56:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757682AbXFML4o (ORCPT ); Wed, 13 Jun 2007 07:56:44 -0400 Received: from mailgate.ics.forth.gr ([139.91.1.2]:59628 "EHLO mailgate.ics.forth.gr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757546AbXFML4n (ORCPT ); Wed, 13 Jun 2007 07:56:43 -0400 Message-ID: <1181735790.466fdb6e87626@webmail.ics.forth.gr> Date: Wed, 13 Jun 2007 14:56:30 +0300 From: mcatos@ics.forth.gr To: linux-kernel@vger.kernel.org Subject: Request merging not doing well MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT User-Agent: Internet Messaging Program (IMP) 3.2.1 X-Originating-IP: 195.74.248.25 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I did some tests to see how requet merging works. Using a dummy ramdisk block device, I did 'dd count=100 bs=4096 if=/dev/zero of=/dev/foo' (using the anticipatory scheduler) and in the request function I got 10 requests: req 1, sector 0, 8 sectors req 2, sector 8, 8 sectors . . . req 10, sector 72, 8 sectors Shouldn'y these requests be merged? Queue default values are: 255 max sectors, 128 max requests. Thanx. ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/