From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay3-d.mail.gandi.net ([217.70.183.195]:42129 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752501Ab3CKK0t convert rfc822-to-8bit (ORCPT ); Mon, 11 Mar 2013 06:26:49 -0400 Received: from mfilter18-d.gandi.net (mfilter18-d.gandi.net [217.70.178.146]) by relay3-d.mail.gandi.net (Postfix) with ESMTP id E1A7DA80C6 for ; Mon, 11 Mar 2013 11:26:47 +0100 (CET) Received: from relay3-d.mail.gandi.net ([217.70.183.195]) by mfilter18-d.gandi.net (mfilter18-d.gandi.net [10.0.15.180]) (amavisd-new, port 10024) with ESMTP id 4sRLcxLqzXcp for ; Mon, 11 Mar 2013 11:26:46 +0100 (CET) Received: from [192.168.1.66] (AMontpellier-256-1-185-24.w92-143.abo.wanadoo.fr [92.143.80.24]) (Authenticated sender: swami@petaramesh.org) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id 754F4A8125 for ; Mon, 11 Mar 2013 11:26:46 +0100 (CET) Message-ID: <513DB161.4050205@petaramesh.org> Date: Mon, 11 Mar 2013 11:26:41 +0100 From: =?ISO-8859-1?Q?Sw=E2mi_Petaramesh?= MIME-Version: 1.0 To: linux-btrfs@vger.kernel.org Subject: BTRFS and "ionice" Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi, I use "ionice -c 3 " to run some low-priority background tasks (i.e. tar, big file copies, or performing checksums sur very big files) using the disk "only when idle", which would be supposed to have very little impact on my system performance meanwhile. I can be pretty sure that those tasks are I/O-bound and use very little CPU (and they are niced as well, anyway). However, when such tasks are running my BTRFS system slows down to a crawl, becomes very very unresponsive, and it seems to me that disk I/O is completely saturated (LED is fixed lit...) So I wonder if BTRFS correctly support ionice, or if it's plain useless ? TIA Kind regards. -- Swâmi Petaramesh http://petaramesh.org PGP 9076E32E Ne cherchez pas : Je ne suis pas sur Facebook.