Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 5 Nov 2001 02:26:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 5 Nov 2001 02:26:27 -0500 Received: from 117.ppp1-1.hob.worldonline.dk ([212.54.84.117]:18304 "EHLO milhouse.home.kernel.dk") by vger.kernel.org with ESMTP id ; Mon, 5 Nov 2001 02:26:17 -0500 Date: Mon, 5 Nov 2001 08:26:02 +0100 From: Jens Axboe To: Andrew Morton Cc: Mike Fedyk , lkml , ext2-devel@lists.sourceforge.net Subject: Re: [Ext2-devel] disk throughput Message-ID: <20011105082602.I2580@suse.de> In-Reply-To: <3BE5F5BF.7A249BDF@zip.com.au>, <3BE5F5BF.7A249BDF@zip.com.au> <20011104193232.A16679@mikef-linux.matchmail.com> <3BE60B51.968458D3@zip.com.au>, <3BE60B51.968458D3@zip.com.au> <20011105080635.D2580@suse.de> <3BE63C53.135106FC@zip.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3BE63C53.135106FC@zip.com.au> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Nov 04 2001, Andrew Morton wrote: > Jens Axboe wrote: > > > > On Sun, Nov 04 2001, Andrew Morton wrote: > > > The meaning of the parameter to elvtune is a complete mystery, and the > > > code is uncommented crud (tautology). So I just used -r20000 -w20000. > > > > It's the number of sectors that are allowed to pass a request on the > > queue, because of merges or inserts before that particular request. So > > you want lower than that probably, and you want READ latency to be > > smaller than WRITE latency too. The default I set is 8192/16384 iirc, so > > go lower than this -- -r512 -w1024 or even lower just to check the > > results. > > Right, thanks. With the ialloc.c one-liner I didn't touch > elvtune. Defaults seem fine. > > It should the number of requests which are allowed to pass a > request, not the number of sectors! > > Well, you know what I mean: Make it > > 1 + nr_sectors_in_request / 1000 That has been tried, performance and latency wasn't good. But yes that is what we are really looking to account, the number of seeks. Approximately. -- Jens Axboe - 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/