Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262190AbVATQ71 (ORCPT ); Thu, 20 Jan 2005 11:59:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262322AbVATQzb (ORCPT ); Thu, 20 Jan 2005 11:55:31 -0500 Received: from mail.tmr.com ([216.238.38.203]:64017 "EHLO gatekeeper.tmr.com") by vger.kernel.org with ESMTP id S262237AbVATQxQ (ORCPT ); Thu, 20 Jan 2005 11:53:16 -0500 Date: Thu, 20 Jan 2005 11:42:11 -0500 (EST) From: Bill Davidsen To: Fruhwirth Clemens cc: Dan Hollis , Venkat Manakkal , Andries Brouwer , Paul Walker , linux-kernel@vger.kernel.org, linux-crypto@nl.linux.org, James Morris Subject: Re: Announce loop-AES-v3.0b file/swap crypto package In-Reply-To: <1106157459.19164.8.camel@ghanima> Message-ID: MIME-Version: 1.0 Content-Type: MULTIPART/SIGNED; MICALG=pgp-sha1; PROTOCOL="application/pgp-signature"; BOUNDARY="=-fjc1Kbnlm7nutSy6fUMk" Content-ID: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3575 Lines: 88 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. --=-fjc1Kbnlm7nutSy6fUMk Content-Type: TEXT/PLAIN; CHARSET=US-ASCII Content-ID: On Wed, 19 Jan 2005, Fruhwirth Clemens wrote: > On Wed, 2005-01-19 at 12:03 -0500, Bill Davidsen wrote: > > On Tue, 18 Jan 2005, Dan Hollis wrote: > > > > > On Tue, 18 Jan 2005, Venkat Manakkal wrote: > > > > As for cryptoloop, I'm sorry, I cannot say the same. The password hashing > > > > system being changed in the past year, poor stability and machine lockups are > > > > what I have noticed, besides there is nothing like the readme here: > > > > > > cryptoloop is also unusably slow, even on my x86_64 machines... > > > > I'm obviously doing something wrong, I just copied about 40MB of old > > kernels (vmlinuz*) and some jpg files into a subdir on my cryptoloop > > filesystem, and I measured 4252.2375kB/s realtime and 18819.7879 kB/s CPU > > time. This doesn't seem unusably slow, even on my mighty P-II/350 and > > eight year old 4GB drives. The hdb is so old it has to run in pio mode, to > > give you an idea, and the original data was not in memory. > > I've rewritten some CBC code to fit the facilities I introduce in my LRW > patch[1]. Here are the results for my P4@1.8GHZ: > > loop-aes, CBC: ~30.5mb/s > dm-crypt, CBC prior to my rewrite: ~23mb/s > dm-crypt, CBC with my LRW patch: ~27mb/s > dm-crypt, LRW with my LRW patch: ~27mb/s (slightly faster than CBC) > > As you can see my LRW patches (actually it's the generic scatterwalker > which is part of the LRW patch set) halves the gap to loop-aes. Actually I was using the built-in cryptoloop, not aes, I was just noting that on a really slow CPU it's still usefully fast in my estimation. > > I'm sure dm-crypt is never going to achieve the speed of loop-aes. > That's just the price you pay, when you have to do things right and > clean, so they get merged into main. Kernel developers are choosey > customers, you know. Yes, I delighted that cryptoloop is in the kernel. The dm-crypt is an interesting method suitable for technically adept users who do all their own sysadmin and need better crypto to protect something very valuable or illegal. But for a company trying to protect information on laptops from casual laptop theves, the existing cryptoloop is fine, and the greater complexity of dm-crypt isn't cost effective. Speed isn't an issue, ease of use and avoiding training costs is. > > [1] http://clemens.endorphin.org/patches/lrw/ > > -- > Fruhwirth Clemens http://clemens.endorphin.org > -- bill davidsen CTO, TMR Associates, Inc Doing interesting things with little computers since 1979. --=-fjc1Kbnlm7nutSy6fUMk Content-Type: APPLICATION/PGP-SIGNATURE; NAME="signature.asc" Content-ID: Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQBB7p+SW7sr9DEJLk4RAlsfAJ9cl/8iN9Thx7qiGQSS2FvCV7bgzACeKDak dQJ5rdIeMY313KhP1nEVSEA= =MSb+ -----END PGP SIGNATURE----- --=-fjc1Kbnlm7nutSy6fUMk-- - 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/