From owner-freebsd-hackers Mon Apr 1 02:05:13 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id CAA13856 for hackers-outgoing; Mon, 1 Apr 1996 02:05:13 -0800 (PST) Received: from ns.NL.net (ns.NL.net [193.78.240.1]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id CAA13847 for ; Mon, 1 Apr 1996 02:05:06 -0800 (PST) Received: from spase by ns.NL.net via EUnet id AA26572 (5.65b/CWI-3.3); Mon, 1 Apr 1996 11:11:39 +0200 Received: from deimos.spase.nl (deimos [192.9.200.239]) by mercurius.spase.nl (8.6.11/8.6.11) with ESMTP id LAA13434 for ; Mon, 1 Apr 1996 11:07:26 +0200 From: Kees Jan Koster Received: (dutchman@localhost) by deimos.spase.nl (8.6.11/8.6.11) id LAA07931 for freebsd-hackers@FreeBSD.ORG; Mon, 1 Apr 1996 11:03:47 +0200 Message-Id: <199604010903.LAA07931@deimos.spase.nl> Subject: HDD cpu usage (IDE vs. SCSI). To: freebsd-hackers@FreeBSD.ORG (FreeBSD hackers Mailing list) Date: Mon, 1 Apr 1996 11:03:46 +0200 (MET DST) X-Mailer: ELM [version 2.4 PL24] 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 Hoi Hackers, I was told that cpu usage of SCSI disks was lower than that of IDE disks. However: LikeEver (amd486DX4-100, ncr pci scsi controller) Seagate -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- Directory MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU /usr 20 1299 81.1 1263 15.5 653 18.2 1778 94.9 1982 41.8 47.7 5.7 /tmp (mfs) 20 689 33.7 285 3.4 274 4.5 397 17.5 503 5.7 27.0 3.3 Maxtor -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- Directory MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU /var 20 750 41.9 740 8.5 405 9.7 764 34.7 770 8.8 32.0 3.9 /tmp (mfs) 20 948 48.5 479 6.4 481 9.3 772 39.0 1228 19.3 39.0 4.7 /msdos 20 28 4.5 74 3.3 43 1.9 111 7.7 111 3.6 9.6 10.9 phobos (pentium 90, on-board IDE controller) Quantum -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- Directory MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU /usr 40 1215 41.7 1818 18.8 811 11.5 1376 41.0 1990 16.0 39.9 3.9 How come the seagate uses twice as much cpu as the quantum? Groetjes, Kees Jan ======================================================================v== Kees Jan Koster e-mail: dutchman@spase.nl Van Somerenstraat 50 tel: NL-24-3234708 6521 BS Nijmegen the Netherlands ========================================================================= Who is this general Failure and why is he reading my disk? (anonymous) =========================================================================