Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753504AbZITD2g (ORCPT ); Sat, 19 Sep 2009 23:28:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752456AbZITD2g (ORCPT ); Sat, 19 Sep 2009 23:28:36 -0400 Received: from dd2934.kasserver.com ([85.13.129.136]:36158 "EHLO dd2934.kasserver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752422AbZITD2f (ORCPT ); Sat, 19 Sep 2009 23:28:35 -0400 X-Greylist: delayed 1193 seconds by postgrey-1.27 at vger.kernel.org; Sat, 19 Sep 2009 23:28:34 EDT Message-ID: <4AB59CBB.8090907@datenparkplatz.de> Date: Sun, 20 Sep 2009 05:08:43 +0200 From: Ulrich Lukas User-Agent: Thunderbird 2.0.0.23 (X11/20090817) MIME-Version: 1.0 To: Linux Kernel Mailing List Subject: Poor desktop responsiveness with background I/O-operations Content-Type: multipart/mixed; boundary="------------020403070101030507020500" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 20378 Lines: 322 This is a multi-part message in MIME format. --------------020403070101030507020500 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Hi, using a recent hard-/software setup, I observed that continuous read/write operations severely degrade the overall system responsiveness in typical desktop-PC use cases. Merely doing write/read operations on a data volume leads to stuck text and mouse cursors, seconds-long delays for simple window-context switches in X11, dropouts in low-resolution video playback etc. Test case: - 64-bit dual-core PC, SATA harddrive, plenty of free RAM - vanilla Linux 2.6.31, Kubuntu 9.10 packages, all software 64-bit How to reproduce: - start KDE/GNOME-session - open a terminal window and do as a non-root user: dd if=/dev/zero of=/home/john-doe/testfile (or dd if=/home/john-doe/big-testfile of=/dev/null) - a real use scenario would be a daily disk-backup or the simple extraction of a tarball containing slightly bigger files Observation: - The system becomes _really_ slow as described above; unusable for any multimedia tasks. - Using an encrypted (dm-crypt/LUKS) /home (e.g. on mobile computers) compounds the issue to a painful extent. Possible culprits (I'm guessing) are the Linux I/O- or CPU scheduler. I realize that a single heavyweight transfer slows down I/O for the corresponding transactions/processes/volumes etc. But there needs to be a fair distribution of I/O or CPU time which leaves enough for other basic operations. And this doesn't seem to be the case with recent Linux versions. On a side note, I've tried the BFS-patches (bfs-221 on 2.6.31): This yields significantly higher throughput when using disk encryption (50% improvement with dm-crypt/LUKS, 512 bit aes-xts-plain cipher mode). But with these patches, the responsiveness was even worse during my quick test. Switching to a text-mode console: several /minutes/ delay... 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