From owner-freebsd-hardware Thu Sep 14 01:23:38 1995 Return-Path: hardware-owner Received: (from majordom@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id BAA00445 for hardware-outgoing; Thu, 14 Sep 1995 01:23:38 -0700 Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120]) by freefall.freebsd.org (8.6.12/8.6.6) with ESMTP id BAA00438 for ; Thu, 14 Sep 1995 01:23:30 -0700 Received: from msmith@localhost by genesis.atrad.adelaide.edu.au (8.6.9/8.6.9) id SAA26640 for hardware@freebsd.org; Thu, 14 Sep 1995 18:05:34 +0930 From: Michael Smith Message-Id: <199509140835.SAA26640@genesis.atrad.adelaide.edu.au> Subject: NCR PCI and system performance... To: hardware@freebsd.org Date: Thu, 14 Sep 1995 18:05:34 +0930 (CST) Content-Type: text Content-Length: 1226 Sender: hardware-owner@freebsd.org Precedence: bulk Greetings hardware gurutype people 8) I have a bit of an interesting one here that I'd appreciate any input on. Config is P100/32M, NCR PCI SCSI, FreeBSD 2.0.5-RELEASE, 4G Hawk. The motherboard is a Soyo 5T A2/A5 Triton unit. The problem is basically that disk I/O kills everything else; something as simple as unpacking a large tarfile drives response into the ground. Disk performance itself isn't a problem; I get around 4M/sec in both directions accoding to iozone, and the system isn't thrashing, or running anything more than a few xterms. Something that caught my eye in the BIOS setup (Award) for this machine were the following options : PCI concurrency, PCI streaming, PCI bursting. All of which are enabled. Not being a PCI guru, I ask : what are these? Why would they be on? Would I be well served by turning them off? -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] My car has "demand start" -Terry Lambert UNIX: live FreeBSD or die! [[