From owner-freebsd-hardware Thu Aug 22 17:15:53 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id RAA07686 for hardware-outgoing; Thu, 22 Aug 1996 17:15:53 -0700 (PDT) Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id RAA07670 for ; Thu, 22 Aug 1996 17:15:42 -0700 (PDT) Received: from msmith@localhost by genesis.atrad.adelaide.edu.au (8.6.12/8.6.9) id JAA17181; Fri, 23 Aug 1996 09:29:19 +0930 From: Michael Smith Message-Id: <199608222359.JAA17181@genesis.atrad.adelaide.edu.au> Subject: Re: ASUS SC200 SCSI card? To: rgrimes@GndRsh.aac.dev.com (Rodney W. Grimes) Date: Fri, 23 Aug 1996 09:29:19 +0930 (CST) Cc: pjchilds@imforei.apana.org.au, se@zpr.uni-koeln.de, msmith@atrad.adelaide.edu.au, freebsd-hardware@FreeBSD.org In-Reply-To: <199608222347.QAA13093@GndRsh.aac.dev.com> from "Rodney W. Grimes" at Aug 22, 96 04:47:01 pm MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hardware@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk Rodney W. Grimes stands accused of saying: > > > > > [ Discussion about hangs on 2.1.5-stable machine with dual ASUS SC200 > > NCR810 PCI scsi controllers follows... may be dangerous to > > mental health ] > ... > > > 2. PCI latency was set to 80... Michael Smith suggested it be lower than > > 32 to i've moved it to 20. > > Set it to exactly 32, no more, no less. ASUS and others have done > 100's of hours of testing and this was found to be the best setting. Even with two 810's coming up for an opcode every us? I'd have thought you'd want to allow for (max latency + one opcode fetch) < 1us so that the second one didn't starve... > Rod Grimes rgrimes@gndrsh.aac.dev.com -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[