From owner-freebsd-hackers Fri Nov 7 22:26:40 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id WAA19448 for hackers-outgoing; Fri, 7 Nov 1997 22:26:40 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from rah.star-gate.com (rah.star-gate.com [204.188.121.18]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id WAA19443 for ; Fri, 7 Nov 1997 22:26:38 -0800 (PST) (envelope-from hasty@rah.star-gate.com) Received: from rah.star-gate.com (localhost.v-site.net [127.0.0.1]) by rah.star-gate.com (8.8.7/8.8.5) with ESMTP id WAA08424 for ; Fri, 7 Nov 1997 22:26:35 -0800 (PST) Message-Id: <199711080626.WAA08424@rah.star-gate.com> X-Mailer: exmh version 2.0gamma 1/27/96 to: hackers@FreeBSD.ORG Subject: Re: Seagate Cheetah performance... In-reply-to: Your message of "Fri, 07 Nov 1997 17:04:50 PST." <199711080104.RAA00593@rah.star-gate.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 07 Nov 1997 22:26:34 -0800 From: Amancio Hasty Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Well, I found a way to nearly double my performance: iozone 48 IOZONE: Performance Test of Sequential File I/O -- V2.01 (10/21/94) By Bill Norcott Operating System: FreeBSD 2.x -- using fsync() Send comments to: b_norcott@xway.com IOZONE writes a 48 Megabyte sequential file consisting of 98304 records which are each 512 bytes in length. It then reads the file. It prints the bytes-per-second rate at which the computer can read and write files. Writing the 48 Megabyte file, 'iozone.tmp'...5.523438 seconds Reading the file...4.921875 seconds IOZONE performance measurements: 9112377 bytes/second for writing the file 10226112 bytes/second for reading the file --- I added this to my kernel config file: options AHC_TAGENABLE options AHC_SCBPAGING_ENABLE options AHC_ALLOW_MEMIO Maybe there is another kernel option to further boost my scsi disk i/o 8) Tnks, Amancio > > Any tweaking that I do to improve the performance of my : > type 0 fixed SCSI 2 > > iozone 48 > > IOZONE: Performance Test of Sequential File I/O -- V2.01 (10/21/94) > By Bill Norcott > > Operating System: FreeBSD 2.x -- using fsync() > > Send comments to: b_norcott@xway.com > > IOZONE writes a 48 Megabyte sequential file consisting of > 98304 records which are each 512 bytes in length. > It then reads the file. It prints the bytes-per-second > rate at which the computer can read and write files. > > > Writing the 48 Megabyte file, 'iozone.tmp'...9.289062 seconds > Reading the file...6.429688 seconds > > IOZONE performance measurements: > 5418377 bytes/second for writing the file > 7828008 bytes/second for reading the file > > My Ultra DMA IDE disk generates about 8MB/sec for writing . > > Tnks, > Amancio > > >