From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263071AbTJPRUT (ORCPT ); Thu, 16 Oct 2003 13:20:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263077AbTJPRUT (ORCPT ); Thu, 16 Oct 2003 13:20:19 -0400 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:22950 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S263071AbTJPRUQ (ORCPT ); Thu, 16 Oct 2003 13:20:16 -0400 Message-ID: <3F8ED342.3020000@pobox.com> Date: Thu, 16 Oct 2003 13:20:02 -0400 From: Jeff Garzik User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030703 X-Accept-Language: en-us, en MIME-Version: 1.0 To: P@draigBrady.com CC: Andrea Arcangeli , Erik Mouw , Josh Litherland , linux-kernel@vger.kernel.org Subject: Re: Transparent compression in the FS References: <1066163449.4286.4.camel@Borogove> <20031015133305.GF24799@bitwizard.nl> <3F8D6417.8050409@pobox.com> <20031016162926.GF1663@velociraptor.random> <3F8ECA3E.4030208@draigBrady.com> In-Reply-To: <3F8ECA3E.4030208@draigBrady.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org P@draigBrady.com wrote: > I thought a bit about this also and thought > that in general the overhead of instant block/file > duplicate merging is not worth it. Periodic > post processing with a merging tool is > much more efficient IMHO. Of course this is > now only possible at the file level, but this The sha1 hash method used by plan9 works at the block level. venti _automatically_ coalesces duplicate blocks, without extra effort, simply by design. Jeff