*BSD News Article 78035


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From: thu@nyx10.cs.du.edu (Timothy Hu)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: 100BaseT tuning considerations?
Date: 10 Sep 1996 16:10:55 -0600
Organization: University of Denver, Dept. of Math & Comp. Sci.
Lines: 20
Message-ID: <514p1f$75h@nyx10.cs.du.edu>
References: <4vin1s$4um@server.cs.vt.edu> <4vsr44$iom@hpindda.cup.hp.com>
NNTP-Posting-Host: nyx10.nyx.net

In article <4vsr44$iom@hpindda.cup.hp.com>, Rick Jones <raj@cup.hp.com> wrote:
>Carl Harris (ceharris@mal.com) wrote:

>How much CPU does it take for the system to drive 10 Mbit Ethernet to
>saturation? Since the MTU does not increase between 10BT and 100BT
>(nor 1000BT?), the host does not become any more "efficient" at
>sending bulk data.

This depends on you NIC. The Intel PRO/100B has a pretty sophisticated
and powerful processor on their NIC. Going full bore, it results in
only about 5-10% of your CPU being used for networking. Cheapo NICs
result in > 50% CPU utilization.

Cheers,
Tim
-- 
Timothy Y Hu (thu@lonetree.com / thu@nyx.net -- http://www.lonetree.com)
Chairman, The Wyoming Operation, Inc. -- Web and Email Solutions for Business
President, Gyan Technologies  -- provider of Information Technology solutions
523 W 27th St., Suite A, Cheyenne, WY 82001   Executive Offices:(307)635-7791