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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 
In-reply-to: Your message of "Tue, 04 Apr 95 20:04:02 CDT."
             <m0rwJVq-000308C@obiwan.pmr.com> 
Date: Tue, 04 Apr 1995 20:47:22 -0700
Message-ID: <1626.797053642@freefall.cdrom.com>
From: "Jordan K. Hubbard" <jkh@freefall.cdrom.com>
Sender: hackers-owner@FreeBSD.org
Precedence: bulk

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