From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751060AbWANQPv (ORCPT ); Sat, 14 Jan 2006 11:15:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751775AbWANQPv (ORCPT ); Sat, 14 Jan 2006 11:15:51 -0500 Received: from liaag1ac.mx.compuserve.com ([149.174.40.29]:37774 "EHLO liaag1ac.mx.compuserve.com") by vger.kernel.org with ESMTP id S1751060AbWANQPv (ORCPT ); Sat, 14 Jan 2006 11:15:51 -0500 Date: Sat, 14 Jan 2006 11:10:09 -0500 From: Chuck Ebbert <76306.1226@compuserve.com> Subject: Re: Fall back io scheduler for 2.6.15? To: Andrew Morton Cc: Jens Axboe , linux-kernel , Mingming Cao Message-ID: <200601141113_MC3-1-B5DA-F6EC@compuserve.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org In-Reply-To: <20060113174914.7907bf2c.akpm@osdl.org> On Fri, 13 Jan 2006, Andrew Morton wrote: > OK. And I assume that AS wasn't compiled, so that's why it fell back? As of 2.6.15 you need to use "anticipatory" instead of "as". Maybe this patch would help? Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com> --- 2.6.15a.orig/block/elevator.c +++ 2.6.15a/block/elevator.c @@ -150,6 +150,13 @@ static void elevator_setup_default(void) if (!chosen_elevator[0]) strcpy(chosen_elevator, CONFIG_DEFAULT_IOSCHED); + /* + * Be backwards-compatible with previous kernels, so users + * won't get the wrong elevator. + */ + if (!strcmp(chosen_elevator, "as")) + strcpy(chosen_elevator, "anticipatory"); + /* * If the given scheduler is not available, fall back to no-op. */ -- Chuck Currently reading: _Olympos_ by Dan Simmons