From owner-freebsd-hackers Mon May 8 12:15:35 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id MAA07904 for hackers-outgoing; Mon, 8 May 1995 12:15:35 -0700 Received: from haven.uniserve.com (haven.uniserve.com [198.53.215.121]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id MAA07898 for ; Mon, 8 May 1995 12:15:31 -0700 Received: by haven.uniserve.com id <228>; Mon, 8 May 1995 12:28:01 -0700 Date: Mon, 8 May 1995 12:26:33 -0700 (PDT) From: Tom Samplonius To: hackers@FreeBSD.org Subject: Is a 486 fast enough for SCSI? Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: hackers-owner@FreeBSD.org Precedence: bulk I've got a AMD486DX4100 with an Adaptec 2940 and two SCSI drives. When I run iozone on one drive I get about 1.9MB/s, but when I run a iozone on each drive I get about .9 MB/s (roughly half). Since the SCSI bus runs at 10MB/s per second, the limiting factor appears to be the CPU? I thought PCI devices required very little CPU time? Tom