Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268597AbTGLWAd (ORCPT ); Sat, 12 Jul 2003 18:00:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268617AbTGLWAd (ORCPT ); Sat, 12 Jul 2003 18:00:33 -0400 Received: from air-2.osdl.org ([65.172.181.6]:15079 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S268597AbTGLWAb (ORCPT ); Sat, 12 Jul 2003 18:00:31 -0400 Date: Sat, 12 Jul 2003 15:15:11 -0700 From: Andrew Morton To: Dave Jones Cc: mroos@linux.ee, linux-kernel@vger.kernel.org, axboe@suse.de Subject: Re: 2.5 'what to expect' Message-Id: <20030712151511.107c1f59.akpm@osdl.org> In-Reply-To: <20030712202352.GA7741@suse.de> References: <20030711140219.GB16433@suse.de> <20030712202352.GA7741@suse.de> X-Mailer: Sylpheed version 0.9.0pre1 (GTK+ 1.2.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1259 Lines: 29 Dave Jones wrote: > > .. > > Something seems amiss. The deprecated elvtune interface is the old -r/-w/-b command line. > I was lead to believe a new elvtune appeared which supports an option > for changing the elevator under 2.5, however a quick google doesn't turn > up any such patched elvtune, so I'm somewhat puzzled. No, we planned to do the selection via sysfs rather than ioctl. > > Maybe just suggest the sysfs interface at once and not mention elvtune? > > Changing the elevator type per device via sysfs does seem to make sense, > however /sys/block//queue/iosched/ doesn't yield anything > that would suggest this is possible (yet). I think Jens has patches for this? But it never happened. There are all sorts of nasties wrt actually making the switch. Some related to request queueing, some to sysfs itself. So yes, we should have runtime selection, and maybe sometime we will, but the lowness of the return-to-effort ratio means it won't happen soon. - 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/