Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765992AbXFSAM7 (ORCPT ); Mon, 18 Jun 2007 20:12:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760382AbXFSAMw (ORCPT ); Mon, 18 Jun 2007 20:12:52 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:59811 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755559AbXFSAMv (ORCPT ); Mon, 18 Jun 2007 20:12:51 -0400 Subject: Re: Change in default vm_dirty_ratio From: Arjan van de Ven To: Linus Torvalds Cc: Andrew Morton , tim.c.chen@linux.intel.com, linux-kernel@vger.kernel.org In-Reply-To: References: <1182201271.4883.22.camel@localhost.localdomain> <20070618164711.9de1c38e.akpm@linux-foundation.org> Content-Type: text/plain Organization: Intel International BV Date: Mon, 18 Jun 2007 17:09:53 -0700 Message-Id: <1182211793.2707.3.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.10.2 (2.10.2-2.fc7) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1087 Lines: 29 > Is it good to keep tons of dirty stuff around? Sure. It allows overwriting > (and thus avoiding doing the write in the first place), but it also allows > for a more aggressive IO scheduling, in that you have more writes that you > can schedule. it also allows for an elevator that can merge more so that there are less seeks... so it's not all pure artificial ;( I really don't like doing just-for-benchmark tuning ... but I wonder how much real workloads this will get too (like installing or upgrading a bunch of rpms) As for the smoother IO thing.. there's already a kernel process that writes this lot out after 5 seconds... so that ought to smooth some of this out already.... I would hope. (I'm not arguing this change is wrong, I'm just grinding my teeth on how long updating rpms already takes... for no apparent reason) - 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/