Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 21 Jun 2002 18:06:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 21 Jun 2002 18:06:33 -0400 Received: from mg01.austin.ibm.com ([192.35.232.18]:2944 "EHLO mg01.austin.ibm.com") by vger.kernel.org with ESMTP id ; Fri, 21 Jun 2002 18:06:33 -0400 Message-ID: <3D13A2B4.236E55DD@us.ibm.com> Date: Fri, 21 Jun 2002 17:03:32 -0500 From: Duc Vianney X-Mailer: Mozilla 4.72 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: Andrew Morton , mgross , "Griffiths, Richard A" , Jens Axboe , Linux Kernel Mailing List , lse-tech@lists.sourceforge.net Subject: [Lse-tech] Re: ext3 performance bottleneck as the number of spindles gets large Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2882 Lines: 64 Andrew Morton wrote: >If you have time, please test ext2 and/or reiserfs and/or ext3 >in writeback mode. I ran IOzone on ext2fs, ext3fs, JFS, and Reiserfs on an SMP 4-way 500MHz, 2.5GB RAM, two 9.1GB SCSI drives. The test partition is 1GB, test file size is 128MB, test block size is 4KB, and IO threads varies from 1 to 6. When comparing with other file system for this test environment, the results on a 2.5.19 SMP kernel show ext3fs is having performance problem with Writes and in particularly, with Random Write. I think the BKL contention patch would help ext3fs, but I need to verify it first. The following data are throughput in MB/sec obtained from IOzone benchmark running on all file systems installed with default options. Kernels 2519smp4 2519smp4 2519smp4 2519smp4 No of threads=1 ext2-1t jfs-1t ext3-1t reiserfs-1t Initial write 138010 111023 29808 48170 Rewrite 205736 204538 119543 142765 Read 236500 237235 231860 236959 Re-read 242927 243577 240284 242776 Random read 204292 206010 201664 207219 Random write 180144 180461 1090 121676 No of threads=2 ext2-2t jfs-2t ext3-2t reiserfs-2t Initial write 196477 143395 62248 55260 Rewrite 261641 261441 126604 205076 Read 292566 292796 313562 291434 Re-read 302239 306423 341416 303424 Random read 296152 295430 316966 288584 Random write 253026 251013 958 203358 No of threads=4 ext2-4t jfs-4t ext3-4t reiserfs-4t Initial write 79513 172302 42051 48782 Rewrite 256568 269840 124912 231395 Read 290599 303669 327066 283793 Re-read 289578 303644 327362 287531 Random read 354011 353455 353806 351671 Random write 279704 279922 2482 250498 No of threads=6 ext2-6t jfs-6t ext3-6t reiserfs-6t Initial write 98559 69825 59728 15576 Rewrite 274993 286987 126048 232193 Read 330522 326143 332147 326163 Re-read 339672 328890 333094 326725 Random read 348059 346154 347901 344927 Random write 281613 280213 3659 227579 Cheers, Duc J Vianney, dvianney@us.ibm.com home page: http://www-124.ibm.com/developerworks/opensource/linuxperf/ project page: http://www-124.ibm.com/developerworks/projects/linuxperf - 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/