Date: Tue, 4 Apr 1995 20:04:02 -0500 (CDT) From: bob@obiwan.pmr.com (Bob Willcox) To: terry@cs.weber.edu (Terry Lambert) Cc: matt@lkg.dec.com, vernick@cs.sunysb.edu, freebsd-hackers@FreeBSD.org Subject: Re: PCI/EISA/ISA performance Message-ID: <m0rwJVq-000308C@obiwan.pmr.com> In-Reply-To: <9504042255.AA20914@cs.weber.edu> from "Terry Lambert" at Apr 4, 95 04:55:48 pm
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Terry Lambert wrote: > > > > Anyone have any performance results comparing the three types of > > > buses? I'm interested in disk I/O performance and/or network > > > I/O performance using the three buses and DMA. > > > > As a rule of thumb, PCI > EISA > ISA. > > Whose thumb are you looking at? 8-). > > VLB has a speed limit of 40MHz (typical cards die > 33MHz, though) > PCI has a speed limit of 33MHz > ISA has a speed limit of 12MHz > EISA has a speed limit of bus clock (mine runs at 50MHz) A recent Buslogic marketing brochure I received claims that their new EISA controllers (BT-747C & BT-757C) can run up to 66MB/second using what they call enhanced master burst mode (EMB). I know nothing more about it. -- Bob Willcox bob@obiwan.pmr.com (or obiwan%bob@uunet.uu.net) Austin, TX
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