Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 13 Apr 2001 07:40:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 13 Apr 2001 07:40:41 -0400 Received: from mailout02.sul.t-online.com ([194.25.134.17]:11526 "EHLO mailout02.sul.t-online.com") by vger.kernel.org with ESMTP id convert rfc822-to-8bit; Fri, 13 Apr 2001 07:40:35 -0400 Content-Type: text/plain; charset=US-ASCII From: Andreas Peter To: linux-kernel@vger.kernel.org Subject: SW-RAID0 Performance problems Date: Fri, 13 Apr 2001 13:47:30 +0200 X-Mailer: KMail [version 1.2] MIME-Version: 1.0 Message-Id: <01041313473002.00533@debian> Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, I've successfully set up SW-RAID0 with Kernel 2.4.3 and Raidtools 0.9. I did this to increase the performance of my HD, but nothig happens. The hdparm results: hdparm -t /dev/md0 : 20.25 MB/sec hdparm -t /dev/hda : 20.51 MB/sec hdaprm -t /dev/hdc : 20.71 MB/sec I thougt the performnace of RAID0 should near 40MB/sec. I played with different chunk-sizes, but the result was everytime the same. The drives are both Maxtor DiamondMax VL40, 30GB, DMA on. No other drive is attached on the bus. Here are also some bonnie++ results: -- RAID-0 -- -- chunk-size=16 -- Version 1.01 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP debian 1G 7416 99 14277 20 7498 10 6942 90 27007 20 113.0 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 267 99 +++++ +++ 10968 100 269 99 +++++ +++ 1388 99 -- chunk-size=32 -- Version 1.01 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP debian 1G 7396 99 14075 20 7469 10 6945 90 26960 20 133.7 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 265 100 +++++ +++ 10695 99 267 99 +++++ +++ 1447 100 -- Single HD /dev/hdc1 -- Version 1.01 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP debian 1G 7173 96 11055 13 5038 6 5999 78 29146 21 90.7 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 272 100 +++++ +++ 10482 99 274 99 +++++ +++ 1437 100 Are there known performanace problems with 2.4.3, or is it necessary to apply patches to the kernel? Or did I something wrong?? Thank you for every hint! Andreas -- Andreas Peter *** ujq7@rz.uni-karlsruhe.de - 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/