From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Jackson Subject: Re: How git affects kernel.org performance Date: Mon, 8 Jan 2007 17:09:34 -0800 Organization: SGI Message-ID: <20070108170934.dafc5b81.pj@sgi.com> References: <1166297434.26330.34.camel@localhost.localdomain> <1166304080.13548.8.camel@nigel.suspend2.net> <459152B1.9040106@zytor.com> <1168140954.2153.1.camel@nigel.suspend2.net> <45A08269.4050504@zytor.com> <45A083F2.5000000@zytor.com> <20070107085526.GR24090@1wt.eu> <20070107011542.3496bc76.akpm@osdl.org> <20070108030555.GA7289@in.ibm.com> <20070108125819.GA32756@thunk.org> <45A24A65.1070706@garzik.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: tytso@mit.edu, suparna@in.ibm.com, akpm@osdl.org, w@1wt.eu, torvalds@osdl.org, hpa@zytor.com, git@vger.kernel.org, nigel@nigel.suspend2.net, warthog9@kernel.org, randy.dunlap@oracle.com, pavel@ucw.cz, linux-kernel@vger.kernel.org, webmaster@kernel.org, linux-ext4@vger.kernel.org X-From: linux-ext4-owner@vger.kernel.org Tue Jan 09 02:11:56 2007 Return-path: Envelope-to: gcfe-linux-ext4@gmane.org Received: from vger.kernel.org ([209.132.176.167]) by lo.gmane.org with esmtp (Exim 4.50) id 1H45Ws-00046N-W9 for gcfe-linux-ext4@gmane.org; Tue, 09 Jan 2007 02:11:55 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750866AbXAIBLx (ORCPT ); Mon, 8 Jan 2007 20:11:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750861AbXAIBLx (ORCPT ); Mon, 8 Jan 2007 20:11:53 -0500 Received: from omx1-ext.sgi.com ([192.48.179.11]:48068 "EHLO omx1.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750857AbXAIBLw (ORCPT ); Mon, 8 Jan 2007 20:11:52 -0500 Received: from imr2.americas.sgi.com (imr2.americas.sgi.com [198.149.16.18]) by omx1.sgi.com (8.12.10/8.12.9/linux-outbound_gateway-1.1) with ESMTP id l0919bDW012143; Mon, 8 Jan 2007 19:09:37 -0600 Received: from v0 (mtv-vpn-hw-masa-1.corp.sgi.com [134.15.25.210]) by imr2.americas.sgi.com (8.12.9/8.12.10/SGI_generic_relay-1.2) with SMTP id l090hknc76600547; Mon, 8 Jan 2007 16:43:46 -0800 (PST) To: Jeff Garzik In-Reply-To: <45A24A65.1070706@garzik.org> X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.8.3; i686-pc-linux-gnu) Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org Archived-At: Jeff wrote: > Something I just thought of: ATA and SCSI hard disks do their own > read-ahead. Probably this is wishful thinking on my part, but I would have hoped that most of the read-ahead they did was for stuff that happened to be on the cylinder they were reading anyway. So long as their read-ahead doesn't cause much extra or delayed disk head motion, what does it matter? -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson 1.925.600.0401