From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932130Ab0IBUiM (ORCPT ); Thu, 2 Sep 2010 16:38:12 -0400 Received: from exprod7og109.obsmtp.com ([64.18.2.171]:53719 "EHLO exprod7og109.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932111Ab0IBUiK (ORCPT ); Thu, 2 Sep 2010 16:38:10 -0400 Message-ID: <4C800B06.90005@genband.com> Date: Thu, 02 Sep 2010 14:37:26 -0600 From: Chris Friesen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-2.fc11 Thunderbird/3.0.4 MIME-Version: 1.0 To: fuse-devel@lists.sourceforge.net, axboe@kernel.dk, Linux Kernel Mailing List Subject: ionice and FUSE-based filesystems? Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 02 Sep 2010 20:37:28.0104 (UTC) FILETIME=[A88A9280:01CB4ADE] X-TM-AS-Product-Ver: SMEX-8.0.0.4160-6.500.1024-17612.000 X-TM-AS-Result: No--9.454600-5.000000-31 X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I'm curious about the limits of using ionice with multiple layers of filesystems and devices. In particular, we have a scenario with a FUSE-based filesystem running on top of xfs on top of LVM, on top of software RAID, on top of spinning disks. (Something like that, anyways.) The IO scheduler is CFQ. In the above scenario would you expect the IO nice value of the writes done by a task to be propagated all the way down to the disk writes? Or would they get stripped off at some point? Thanks, Chris -- Chris Friesen Software Developer GENBAND chris.friesen@genband.com www.genband.com