From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755377Ab3L1NWx (ORCPT ); Sat, 28 Dec 2013 08:22:53 -0500 Received: from mx1.redhat.com ([209.132.183.28]:29533 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755345Ab3L1NWw (ORCPT ); Sat, 28 Dec 2013 08:22:52 -0500 Date: Sat, 28 Dec 2013 13:22:48 +0000 From: Alasdair G Kergon To: Shaohua Li Cc: linux-kernel@vger.kernel.org, dm-devel@redhat.com, axboe@kernel.dk, agk@redhat.com, snitzer@redhat.com Subject: Re: [dm-devel] [PATCG]DM: dm-compression: a compressed DM target for SSD Message-ID: <20131228132248.GB16613@agk-dp.fab.redhat.com> Mail-Followup-To: Shaohua Li , linux-kernel@vger.kernel.org, dm-devel@redhat.com, axboe@kernel.dk, agk@redhat.com, snitzer@redhat.com References: <20131227062421.GA21053@kernel.org> <20131228125725.GA16613@agk-dp.fab.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131228125725.GA16613@agk-dp.fab.redhat.com> Organization: Red Hat UK Ltd. Registered in England and Wales, number 03798903. Registered Office: 64 Baker Street, 4th floor, London, W1U 7DF. User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Dec 28, 2013 at 12:57:25PM +0000, Alasdair G Kergon wrote: > To use this compression target above dm-thin (likely to prefer larger > block sizes), for example, could the block sizes be adapatable / > configurable? So a key feature of the underlying thin provisioning needs to be efficient tracking of a small sector size (which doesn't suit the existing dm-thin target). This compression target could sometimes benefit from a larger block size though, particularly where the data above has large blocks. (Could we name this something like 'microcompression'?) Alasdair