From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932535Ab1ISSkU (ORCPT ); Mon, 19 Sep 2011 14:40:20 -0400 Received: from lennier.cc.vt.edu ([198.82.162.213]:53838 "EHLO lennier.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932338Ab1ISSkS (ORCPT ); Mon, 19 Sep 2011 14:40:18 -0400 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.3-dev To: martin f krafft Cc: linux kernel mailing list Subject: Re: Abysmal I/O scheduling with dm-crypt In-Reply-To: Your message of "Tue, 30 Aug 2011 09:14:07 +0200." <20110830071407.GA8165@albatross.gern.madduck.net> From: Valdis.Kletnieks@vt.edu References: <20110830071407.GA8165@albatross.gern.madduck.net> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1316457549_2864P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Mon, 19 Sep 2011 14:39:09 -0400 Message-ID: <10932.1316457549@turing-police.cc.vt.edu> X-Mirapoint-Received-SPF: 198.82.161.152 auth3.smtp.vt.edu Valdis.Kletnieks@vt.edu 2 pass X-Junkmail-Status: score=10/50, host=steiner.cc.vt.edu X-Junkmail-Signature-Raw: score=unknown, refid=str=0001.0A020201.4E778C4E.00AA,ss=1,fgs=0, ip=0.0.0.0, so=2010-07-22 22:03:31, dmn=2009-09-10 00:05:08, mode=single engine X-Junkmail-IWF: false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1316457549_2864P Content-Type: text/plain; charset=us-ascii On Tue, 30 Aug 2011 09:14:07 +0200, martin f krafft said: > I am using encrypted filesystems (dm-crypt) and the 3.0.0 kernel. > Underneath might be a RAID1 or a fast SSD. On top is usually LVM > with a few LVs holding the system. > > Whenever an I/O-intensive task starts, such as: > the system becomes unusable for several seconds at a time, at least > once or twice per minute. Sorry for the late reply - I've seen similar on my laptop. However, I haven't dug further into it, because the use case that causes the most pain is backing up the laptop to a LUKS partition on an external USB drive - and I usually start that and go to bed so it's not-a-problem. Also, it only wedges up those processes that actually try to do disk I/O - which means that all the terminal windows that are running SSH to various servers don't usually take a hit and things don't get "unusable" in the sense of "totally weged and locked up". But I can at least confirm you're not hallucinating. :) --==_Exmh_1316457549_2864P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFOd4xNcC3lWbTT17ARAltXAKCl6CMCqpDfS1h9ZZX6fwXd6/f/UACdG7BJ CQi5N7Em9oDr44UbAi7EHD8= =xSLk -----END PGP SIGNATURE----- --==_Exmh_1316457549_2864P--