Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753705AbZITUWU (ORCPT ); Sun, 20 Sep 2009 16:22:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751416AbZITUWS (ORCPT ); Sun, 20 Sep 2009 16:22:18 -0400 Received: from cantor2.suse.de ([195.135.220.15]:51097 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750898AbZITUWR (ORCPT ); Sun, 20 Sep 2009 16:22:17 -0400 Date: Sun, 20 Sep 2009 22:22:20 +0200 (CEST) From: Jiri Kosina X-X-Sender: jikos@twin.jikos.cz To: Ulrich Lukas Cc: Linux Kernel Mailing List , Jan Kara Subject: Re: Poor desktop responsiveness with background I/O-operations In-Reply-To: <4AB59CBB.8090907@datenparkplatz.de> Message-ID: References: <4AB59CBB.8090907@datenparkplatz.de> User-Agent: Alpine 2.00 (LRH 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1020 Lines: 33 On Sun, 20 Sep 2009, Ulrich Lukas wrote: > 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. I guess that switching from CFQ to deadline I/O scheduler improves the situation, right? -- Jiri Kosina SUSE Labs, Novell Inc. -- 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/