Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1162957AbbKFU16 (ORCPT ); Fri, 6 Nov 2015 15:27:58 -0500 Received: from mail-wi0-f179.google.com ([209.85.212.179]:35325 "EHLO mail-wi0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1162881AbbKFU1z (ORCPT ); Fri, 6 Nov 2015 15:27:55 -0500 Date: Fri, 6 Nov 2015 20:27:50 +0000 From: Sami Tolvanen To: device-mapper development Cc: Mikulas Patocka , Will Drewry , Kees Cook , Mike Snitzer , Mandeep Baines , linux-kernel@vger.kernel.org, Mark Salyzyn Subject: Re: [dm-devel] [PATCH 0/4] dm verity: add support for error correction Message-ID: <20151106202750.GA11849@google.com> References: <1446688954-29589-1-git-send-email-samitolvanen@google.com> <563B066C.6050202@redhat.com> <20151106190634.GA2813@google.com> <563CFD6F.4040009@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <563CFD6F.4040009@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 722 Lines: 16 On Fri, Nov 06, 2015 at 08:20:15PM +0100, Zdenek Kabelac wrote: > i.e. you have 1G of space - you want to give 250MB as 'redundancy' - > so create 4 partition.... We cannot afford to set aside 25% of read-only partition space for redundancy on mobile devices, and would rather not impact performance any more than dm-verity already does. With error correction we have 0.8% space overhead in our use case and no performance degradation if the partition is not corrupted. Sami -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/