From owner-freebsd-current Mon Aug 26 08:33:21 1996 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id IAA19544 for current-outgoing; Mon, 26 Aug 1996 08:33:21 -0700 (PDT) Received: from hp.com (hp.com [15.255.152.4]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id IAA19534 for ; Mon, 26 Aug 1996 08:33:04 -0700 (PDT) Received: from srmail.sr.hp.com by hp.com with ESMTP (1.37.109.16/15.5+ECS 3.3) id AA131663582; Mon, 26 Aug 1996 08:33:02 -0700 Received: from hpnmhjw.sr.hp.com by srmail.sr.hp.com with ESMTP (1.37.109.16/15.5+ECS 3.3) id AA164283579; Mon, 26 Aug 1996 08:33:00 -0700 Received: from mina.sr.hp.com by hpnmhjw.sr.hp.com with SMTP (1.37.109.16/15.5+ECS 3.3) id AA141643579; Mon, 26 Aug 1996 08:32:59 -0700 Message-Id: <199608261532.AA141643579@hpnmhjw.sr.hp.com> To: current@freefall.freebsd.org Cc: "Rodney W. Grimes" Subject: Re: Speedingup the "worldstone" In-Reply-To: Your message of "Sun, 25 Aug 1996 23:08:11 PDT." Date: Mon, 26 Aug 1996 08:32:59 -0700 From: Darryl Okahata Sender: owner-current@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Rodney W. Grimes wrote: > More correctly you won't get more than 6 to 8MB/s on ISA based 486 > systems, On an ISA-based system, it's a lot closer to 2MB/s (sustained, not burst). (Or, are you talking about RAID/striping?) Here are some bonnie numbers for a Quantum Fireball 1280S. Note the huge improvement going from ISA to PCI. The first is for an ISA-based 1542CF controller, and the second is for an NCR815/PCI-based controller: -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU ISA/1280 60 1349 95.2 2237 63.9 804 35.7 1361 92.2 1943 22.0 42.6 5.7 PCI/1280 256 4267 86.3 4393 19.2 1207 8.3 4118 77.9 4620 17.8 56.8 2.5 The exact same drive mechanism was used on two systems: * 486DX4/100 w/256K cache, 24MB RAM, & an ISA-based Adaptec 1542CF. FreeBSD 2.1R, untuned kernel, untuned 1542 (DMA setting of 5MB/sec). * P133 w/512K cache, 64MB RAM, & an NCR815-based PCI SCSI controller. FreeBSD 2.1R, untuned kernel The block numbers above should be CPU-independent, although I'm not sure about the "per-char" ones; these might be impacted by CPU performance. -- Darryl Okahata Internet: darrylo@sr.hp.com DISCLAIMER: this message is the author's personal opinion and does not constitute the support, opinion, or policy of Hewlett-Packard, or of the little green men that have been following him all day.