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Date:      Thu, 15 Apr 1999 09:00:11 +0300
From:      Vallo Kallaste <vallo@matti.ee>
To:        "Brian's Mail" <bellefso@execpc.com>
Cc:        FreeBSD Questions <freebsd-questions@FreeBSD.ORG>
Subject:   Re: 2 or 4 port Ethernet cards
Message-ID:  <19990415090011.B23171@matti.ee>
In-Reply-To: <NCBBLDHPCJFJEDOEPEBFEEAKCHAA.bellefso@execpc.com>; from Brian's Mail on Wed, Apr 14, 1999 at 05:35:45PM -0500
References:  <19990414115146.24299@ccsales.com> <NCBBLDHPCJFJEDOEPEBFEEAKCHAA.bellefso@execpc.com>

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On Wed, Apr 14, 1999 at 05:35:45PM -0500, Brian's Mail <bellefso@execpc.com> wrote:

> The PCI Bus can do 132 MB/sec so in theory the bus can handle 4 100Mb ports.
> This would be roughly 50 MB/sec. So it shouldn't matter if there are 4
> seperate cards or a card with four ports, whether or not the card can
> sustain that output is the important thing.

Also don't forget that the disk I/O belongs to the same PCI bus 
usually and takes some bandwidth... so you can't give all the 
performance to network interface. I don't know about the balance of 
these, somebody more knowledgeable should explain. I have heard 
rumours that 64bit and 66Mhz PCI busses exist?
-- 

Vallo Kallaste
vallo@matti.ee


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