From owner-freebsd-hackers Wed May 17 23:21:14 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id XAA26043 for hackers-outgoing; Wed, 17 May 1995 23:21:14 -0700 Received: from gndrsh.aac.dev.com (gndrsh.aac.dev.com [198.145.92.241]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id XAA26036 for ; Wed, 17 May 1995 23:21:11 -0700 Received: (from rgrimes@localhost) by gndrsh.aac.dev.com (8.6.11/8.6.9) id XAA13592; Wed, 17 May 1995 23:20:18 -0700 From: "Rodney W. Grimes" Message-Id: <199505180620.XAA13592@gndrsh.aac.dev.com> Subject: Re: Adaptec 2940? To: tom@haven.uniserve.com (Tom Samplonius) Date: Wed, 17 May 1995 23:20:17 -0700 (PDT) Cc: gibbs@estienne.CS.Berkeley.EDU, hackers@FreeBSD.org In-Reply-To: from "Tom Samplonius" at May 17, 95 11:02:45 pm X-Mailer: ELM [version 2.4 PL24] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Length: 1495 Sender: hackers-owner@FreeBSD.org Precedence: bulk > > > On Wed, 17 May 1995, Justin T. Gibbs wrote: > > > The drivers are identical, so the interupt time should be the same for > > driving either card on the same machine. Your benchmark is not really > > valid since they were run on different motherboards. > > To some extent. It is instesting that a good EISA system can best a > poor PCI system. Woe to those buying cheap PCI motherboards. My old 486DX33 ECS EISA/VLB Sis chipset with write back cache performs better at memory speed benchmarks than most cheap PCI motherboards by a large margin (29MB/sec on the EISA board, I have seen as low as 20MB/sec on some PCI boards for the same test, same memory size, same CPU chip]) The fastest 486 PCI motherboard I have tested is the ASUS PCI/I-486SP3G, it uses 72 pin simms and memory interleaving (Ie, you *must* install simms in pairs). With a DX4-100 CPU chip in this board you can beat almost every P5-60 out there in ``time make CLOBBER=true world'' given identical memory and disk setup. My data on the ASUS PVI-486AP4 is not comparible as it was done using a DX33 chip, but the gut feeling of the box is that it has okay, but not great memory bandwidth. I was also running it with 1 8MB simm. Guess I should go configure the standard DX2/66 16MB on that board and run the test to see where it stacks up in the pile. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Custom computers for FreeBSD