From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161398AbXDWLNu (ORCPT ); Mon, 23 Apr 2007 07:13:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161403AbXDWLNt (ORCPT ); Mon, 23 Apr 2007 07:13:49 -0400 Received: from svr68.ehostpros.com ([67.15.48.48]:26398 "EHLO svr68.ehostpros.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161398AbXDWLNs (ORCPT ); Mon, 23 Apr 2007 07:13:48 -0400 Subject: Re: ChunkFS - measuring cross-chunk references From: Kalpak Shah To: Karuna sagar K Cc: Amit Gud , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <2e4afe1e0704230019h3853bc82uae6c9b5cdc325ab9@mail.gmail.com> References: <2e4afe1e0704221335y6d4c84d8id65e71826ce60acb@mail.gmail.com> <462B8D0C.7020509@ksu.edu> <2e4afe1e0704230019h3853bc82uae6c9b5cdc325ab9@mail.gmail.com> Content-Type: text/plain Date: Mon, 23 Apr 2007 15:04:36 +0530 Message-Id: <1177320876.23226.7.camel@garfield> Mime-Version: 1.0 X-Mailer: Evolution 2.8.0 (2.8.0-7.fc6) Content-Transfer-Encoding: 7bit X-Antivirus-Scanner: Clean mail though you should still use an Antivirus X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - svr68.ehostpros.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - linsyssoft.com X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2007-04-23 at 12:49 +0530, Karuna sagar K wrote: > Hi, > > The tool estimates the cross-chunk references from an extt2/3 file > system. It considers a block group as one chunk and calcuates how many > block groups does a file span across. So, the block group size gives > the estimate of chunk size. > > The file systems were aged for about 3-4 months on a developers laptop. > With a blocksize of 4KB, a block group would be 128 MB. In the original Chunkfs paper, Valh had mentioned 1GB chunks and I believe it will be possible to use 2GB, 4GB or 8GB chunks in the future. As the chunk size increases the number of cross-chunk references will reduce and hence it might be a good idea to present these statistics considering different chunk sizes starting from 512MB upto 2GB. Thanks, Kalpak.