Date: Wed, 17 May 1995 23:20:17 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: tom@haven.uniserve.com (Tom Samplonius) Cc: gibbs@estienne.CS.Berkeley.EDU, hackers@FreeBSD.org Subject: Re: Adaptec 2940? Message-ID: <199505180620.XAA13592@gndrsh.aac.dev.com> In-Reply-To: <Pine.BSF.3.91.950517225856.9253A-100000@haven.uniserve.com> from "Tom Samplonius" at May 17, 95 11:02:45 pm
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> > > 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
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