From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759096AbXFQFDW (ORCPT ); Sun, 17 Jun 2007 01:03:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751712AbXFQFDN (ORCPT ); Sun, 17 Jun 2007 01:03:13 -0400 Received: from waste.org ([66.93.16.53]:41742 "EHLO waste.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751493AbXFQFDM (ORCPT ); Sun, 17 Jun 2007 01:03:12 -0400 Date: Sun, 17 Jun 2007 00:02:55 -0500 From: Matt Mackall To: Arjan van de Ven Cc: Andrew Morton , Christoph Lameter , linux-kernel@vger.kernel.org, hch@infradead.org Subject: Re: [patch 00/14] Page cache cleanup in anticipation of Large Blocksize support Message-ID: <20070617050255.GM11166@waste.org> References: <20070614193839.878721298@sgi.com> <20070614130645.cabdff1b.akpm@linux-foundation.org> <20070614143248.736312f8.akpm@linux-foundation.org> <1182043500.2743.7.camel@laptopd505.fenrus.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1182043500.2743.7.camel@laptopd505.fenrus.org> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jun 16, 2007 at 06:25:00PM -0700, Arjan van de Ven wrote: > > > You: conceptully-new add-on which benefits 0.25% of the user base, provided > > they select the right config options and filesystem. > > > > Me: simpler enhancement which benefits 100% of the user base (ie: includes > > 4k blocksize, 4k pagesize) and which also fixes your performance problem > > with that HBA. > > note that at least 2.6 is doing this "sort of", better than 2.4 at > least. (30% hitrate or something like that). Is it? Last I looked it had reverted to handing out reverse-contiguous pages. You can see this by running /proc/pid/pagemap through hexdump. -- Mathematics is the supreme nostalgia of our time.