From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Fri, 11 Aug 2006 20:16:27 -0700 (PDT) Received: from rwcrmhc11.comcast.net (rwcrmhc11.comcast.net [204.127.192.81]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id k7C3G8DW003579 for ; Fri, 11 Aug 2006 20:16:08 -0700 Message-ID: <44DD46A5.7010308@comcast.net> Date: Fri, 11 Aug 2006 23:10:29 -0400 From: Brian Davis MIME-Version: 1.0 Subject: Negligible improvement when using su/sw for hardware RAID5, expected? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: xfs-bounce@oss.sgi.com Errors-To: xfs-bounce@oss.sgi.com List-Id: xfs To: xfs@oss.sgi.com Is this expected? I thought I would see more improvement when tweaking my su/sw values for hardware RAID 5. Details, 3x300GB drives, 3Ware 7506-4LP Hardware RAID 5 using a 64K stripe size (non-configurable on this card). FS creation and Bonnie++ results: Untweaked:---------------------------------------------------------------------- localhost / # mkfs.xfs -f /dev/sda1 meta-data=/dev/sda1 isize=256 agcount=32, agsize=4578999 blks = sectsz=512 attr=0 data = bsize=4096 blocks=146527968, imaxpct=25 = sunit=0 swidth=0 blks, unwritten=1 naming =version 2 bsize=4096 log =internal log bsize=4096 blocks=32768, version=1 = sectsz=512 sunit=0 blks realtime =none extsz=65536 blocks=0, rtextents=0 localhost / # mount -t xfs /dev/sda1 /raid localhost / # cd /raid localhost raid # bonnie++ -n0 -u0 -r 768 -s 30720 -b -f Using uid:0, gid:0. Writing intelligently...done Rewriting...done Reading intelligently...done start 'em...done...done...done...done...done... Version 1.93c ------Sequential Output------ --Sequential Input- --Random- Concurrency 1 -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 localhost 30G 27722 40 23847 37 98367 99 88.6 11 Latency 891ms 693ms 16968us 334ms Tweaked:------------------------------------------------------------------------- localhost / # mkfs.xfs -f -d sw=2,su=64k /dev/sda1 meta-data=/dev/sda1 isize=256 agcount=32, agsize=4578992 blks = sectsz=512 attr=0 data = bsize=4096 blocks=146527744, imaxpct=25 = sunit=16 swidth=32 blks, unwritten=1 naming =version 2 bsize=4096 log =internal log bsize=4096 blocks=32768, version=1 = sectsz=512 sunit=0 blks realtime =none extsz=65536 blocks=0, rtextents=0 localhost / # mount -t xfs /dev/sda1 /raid localhost / # cd /raid localhost raid # bonnie++ -n0 -u0 -r 768 -s 30720 -b -f Using uid:0, gid:0. Writing intelligently...done Rewriting...done Reading intelligently...done start 'em...done...done...done...done...done... Version 1.93c ------Sequential Output------ --Sequential Input- --Random- Concurrency 1 -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 localhost 30G 27938 43 23880 40 98066 99 91.8 9 Latency 772ms 584ms 19889us 340ms