Date: Tue, 04 Apr 1995 20:47:22 -0700 From: "Jordan K. Hubbard" <jkh@freefall.cdrom.com> To: bob@obiwan.pmr.com (Bob Willcox) Cc: terry@cs.weber.edu (Terry Lambert), matt@lkg.dec.com, vernick@cs.sunysb.edu, freebsd-hackers@FreeBSD.org Subject: Re: PCI/EISA/ISA performance Message-ID: <1626.797053642@freefall.cdrom.com> In-Reply-To: Your message of "Tue, 04 Apr 95 20:04:02 CDT." <m0rwJVq-000308C@obiwan.pmr.com>
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I just got a call from Buslogic's VP of Engineering. He's sending me his full specs on this stuff.. Jordan > 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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