From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264606AbTIDCvR (ORCPT ); Wed, 3 Sep 2003 22:51:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264621AbTIDCvK (ORCPT ); Wed, 3 Sep 2003 22:51:10 -0400 Received: from smtp.bitmover.com ([192.132.92.12]:24707 "EHLO smtp.bitmover.com") by vger.kernel.org with ESMTP id S264606AbTIDCtP (ORCPT ); Wed, 3 Sep 2003 22:49:15 -0400 Date: Wed, 3 Sep 2003 19:49:04 -0700 From: Larry McVoy To: William Lee Irwin III , "Martin J. Bligh" , Alan Cox , "Brown, Len" , Giuliano Pochini , Larry McVoy , Linux Kernel Mailing List Subject: Re: Scaling noise Message-ID: <20030904024904.GI5227@work.bitmover.com> Mail-Followup-To: Larry McVoy , William Lee Irwin III , "Martin J. Bligh" , Alan Cox , "Brown, Len" , Giuliano Pochini , Larry McVoy , Linux Kernel Mailing List References: <20030903180547.GD5769@work.bitmover.com> <20030903181550.GR4306@holomorphy.com> <1062613931.19982.26.camel@dhcp23.swansea.linux.org.uk> <20030903194658.GC1715@holomorphy.com> <105370000.1062622139@flay> <20030903212119.GX4306@holomorphy.com> <115070000.1062624541@flay> <20030903215135.GY4306@holomorphy.com> <20030904005822.GC5227@work.bitmover.com> <20030904011253.GA4306@holomorphy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030904011253.GA4306@holomorphy.com> User-Agent: Mutt/1.4i X-MailScanner-Information: Please contact the ISP for more information X-MailScanner: Found to be clean X-MailScanner-SpamCheck: not spam (whitelisted), SpamAssassin (score=0.5, required 7, AWL, DATE_IN_PAST_06_12) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 03, 2003 at 06:12:53PM -0700, William Lee Irwin III wrote: > On Wed, Sep 03, 2003 at 02:51:35PM -0700, William Lee Irwin III wrote: > >> This is only truly feasible when the nodes are homogeneous. They will > >> not be as there will be physical locality (esp. bits like device > >> proximity) concerns. > > On Wed, Sep 03, 2003 at 05:58:22PM -0700, Larry McVoy wrote: > > Huh? The nodes are homogeneous. Devices are either local or proxied. > > Virtualized devices are backed by real devices at some level, so the > distance from the node's physical location to the device's then matters. Go read what I've written about this. There is no sharing, devices are local or remote. You share in the page cache only, if you want fast access to a device you ask it to put the data in memory and you map it. It's absolutely as fast as an SMP. With no locking. -- --- Larry McVoy lm at bitmover.com http://www.bitmover.com/lm