From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@bugzilla.kernel.org Subject: [Bug 71641] Unreasonable performance degradation in ext4 with full data journaling Date: Fri, 21 Mar 2014 08:48:34 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit To: linux-ext4@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.19.201]:50114 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754089AbaCUIsi (ORCPT ); Fri, 21 Mar 2014 04:48:38 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 05E1B202B8 for ; Fri, 21 Mar 2014 08:48:37 +0000 (UTC) Received: from bugzilla2.web.kernel.org (bugzilla2.web.kernel.org [172.20.200.52]) by mail.kernel.org (Postfix) with ESMTP id 12863202A1 for ; Fri, 21 Mar 2014 08:48:36 +0000 (UTC) In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: https://bugzilla.kernel.org/show_bug.cgi?id=71641 Chia-Hung Chang changed: What |Removed |Added ---------------------------------------------------------------------------- Kernel Version|3.4.6 |3.11 --- Comment #5 from Chia-Hung Chang --- (In reply to Theodore Tso from comment #4) > Could you retry your measurements using the latest kernel? At least 3.11, > and preferably 3.13. > > We significantly optimized the write path for the nodelalloc case in 3.11. > That should fix the average size being so small for the nodelalloc case: > > Thanks for your advice. The kernel version is changed from 3.4 to 3.11. The write throughput of data=journal is still only 40% of data=order. Do you think what may be wrong in this mode ? --------------------- Test environment-- CPU: Intel(R) Xeon(R) CPU E3-1225 v3 @ 3.20GHz RAM:8GB Filesystem:Ext4 Linux version: ubuntu-saucy with kernel 3.11 128MB ramdisk is used as journaling area RAID0 are composed of 6 x 1TB HD Command: time dd if=/dev/zero of= Write_File bs=1M count=5120 data=journal -> 398MB/s data=ordered ->1.1GB/s data=ordered ,nodelalloc -> 1G/s blktrace results can be downloaded in https://dl.dropboxusercontent.com/u/32959539/blktrace_with_3_11.7z btt results can be downloaded in https://dl.dropboxusercontent.com/u/32959539/BTT_with_3_11.7z For linux 3.4, the write throughputs are data=journal -> 397MB/s data=ordered -> 937MB/s data=ordered ,nodelalloc -> 863MB/s* *PS. the previous data is mistaken, please use this version. -- You are receiving this mail because: You are watching the assignee of the bug.