From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Ewell Subject: Re: slow after upgrade to CentOS 5 (RHEL5) Date: Sun, 18 Nov 2007 15:37:47 -0800 Message-ID: <4740CCCB.30604@verizon.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from vms042pub.verizon.net ([206.46.252.42]:34085 "EHLO vms042pub.verizon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753219AbXKRXiN (ORCPT ); Sun, 18 Nov 2007 18:38:13 -0500 Received: from rn1.rent-a-nerd.local ([71.125.118.123]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTPA id <0JRQ000CF6Z07NQ0@vms042.mailsrvcs.net> for linux-scsi@vger.kernel.org; Sun, 18 Nov 2007 17:37:49 -0600 (CST) Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Cc: bo.yang@lsi.com, James Bottomley , "Patro, Sumant" , Mark Harvey > James Bottomley wrote: >> Please don't drop the cc lists. There are others who probably have more >> informed opinions than I do who won't get to comment if they don't see >> it. >> >> On Sun, 2007-10-28 at 17:36 -0700, Anthony Ewell wrote: >>> James Bottomley wrote: >>>> On Sat, 2007-10-27 at 13:21 -0700, Anthony Ewell wrote: >>>>> James Bottomley wrote: >>>>>> On Wed, 2007-10-24 at 18:04 -0700, Anthony Ewell wrote: >>>>>>> Hi All, >>>>>>> >>>>>>> If you all would not mind a post from the general >>>>>>> public Linux user, after doing a complete disk wipe >>>>>>> of CentOS 4 and installing CentOS5, my system is preceived >>>>>>> to be 3 times slower. > > > Did some test from my install CD/DVD's in "rescue mode" on > Computer C. I used the same backup script (dump) that > I use in normal boot mode. I stopped the backup > after dump gave the first estimate of time: > > "dump" CentOS5 install DVD in rescue mode: > transfer rate 4422 KB/s, estimated finish 4:10 > > "dump" CentOS4.4 (2.6.9-42.EL) install CD in rescue mode: > transfer rate 8468 KB/s, estimated finish 2:09 > > I also got a "dmesg" from computer B, as requested by Sumant. > Computer B: VXA-3, CentOS 4.5 , SATA-150-4 > > -T > > Hi All, > > I also tested using the System Rescue CD from > http://www.sysresccd.org. > > I used the same backup script (dump) that I use in normal > boot mode. I stopped the backup after dump gave the first > estimate of time: > > "dump" System Rescue CD (Kernel 2.6.22.9): > transfer rate 4370 KB/s, estimated finish 4:15 > > So, I would say, the problem is not confined to CentOS 5, > but goes all the way up to the 2.6.22.9 kernel. I hope > this is a good clue. > > -T Hi All, I ran a "bonnie++" on both Computer B and computer C. I am not seeing any massive differences between the two that would account for the massive slowdown between Cent OS 4.4 (2.6.9-42.EL) and Cent OS 5 (2.6.18-8.1.15.el5). Anyone have any suggestions as to how to track this down? Many thanks, -T Comparison of Computer B and Computer C with "bonnie++": Computer B (CentOS4): ------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 server.foo.lo 4G 31384 70 46283 16 21902 8 40179 82 49199 9 196.8 0 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 23106 71 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ server.foo.local,4G,31384,70,46283,16,21902,8,40179,82,49199,9,196.8,0,16,23106,71,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++ Computer C (CentOS5): ------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 rn1.foo. 4G 32240 68 40951 9 24177 5 46265 86 71005 9 179.5 0 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ rn1.rent-a-nerd.local,4G,32240,68,40951,9,24177,5,46265,86,71005,9,179.5,0,16,++ +++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++