From owner-freebsd-hackers Fri Nov 29 20:30:39 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id UAA22737 for hackers-outgoing; Fri, 29 Nov 1996 20:30:39 -0800 (PST) Received: from kaori.communique.net (kaori.Communique.Net [204.27.65.55]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id UAA22729; Fri, 29 Nov 1996 20:30:35 -0800 (PST) Received: by kaori.communique.net with Microsoft Exchange (IMC 4.0.837.3) id <01BBDE44.9BB3E0E0@kaori.communique.net>; Fri, 29 Nov 1996 22:28:13 -0600 Message-ID: From: Raul Zighelboim To: "'hackers@freefall.freebsd.org'" Cc: "'hardware@freefall.freebsd.org'" Subject: Adaptec UW controller and Seagate Elite performance ? Date: Fri, 29 Nov 1996 22:28:12 -0600 X-Mailer: Microsoft Exchange Server Internet Mail Connector Version 4.0.837.3 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk .0 Hello there! My system is not performing as expected. Trying to find out were the bottleneck is, I run Bonnie and iozone benchmarks on the system while no i/o processes were running. I got the following results: # bonnie -s 40 (akira, http running) -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU 40 3271 34.8 3085 13.0 1559 8.3 10330 97.1 44763 95.7 991.0 20.4 and IOZONE performance measurements: 2039008 bytes/second for writing the file 34861747 bytes/second for reading the file It bothered me that: 1- reading is 20 times faster than writing 2- 2Mbytes/s for writing seems slow, even if this was a scsi-2 and not an scsi fast and wide drive. Are this results the expected values for a UW scsi drive/controller ?, and if not, can someone point me in the correct direction to get this resolved ? Thanks. ------------------------ ------------------------ Raul Zighelboim Communique Inc. mailto:mango@communique.net http://www.communique.net