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Date:      Sun, 17 Feb 2002 17:09:29 -0800
From:      David Greenman <dg@root.com>
To:        Terry Lambert <tlambert2@mindspring.com>
Cc:        Roy Sigurd Karlsbakk <roy@karlsbakk.net>, Dag-Erling Smorgrav <des@ofug.org>, Thomas Hurst <tom.hurst@clara.net>, hiten@uk.FreeBSD.org, hackers@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG
Subject:   Re: in-kernel HTTP Server for FreeBSD?
Message-ID:  <20020217170929.D80718@nexus.root.com>
In-Reply-To: <3C703A92.2EBD3E67@mindspring.com>; from tlambert2@mindspring.com on Sun, Feb 17, 2002 at 03:19:46PM -0800
References:  <Pine.LNX.4.30.0202171935060.6486-100000@mustard.heime.net> <3C703A92.2EBD3E67@mindspring.com>

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>"Zero copy" usually means "zero unnecessary copies"; but
>what someone thinks of as "necessary" is really based on
>their bias towards an existing implementation.

   "zero copy" these days has come to mean no copies that involve
the CPU. In my experiance, raw memory bandwidth to DMA packets
to/from main memory is not the bottleneck on modern hardware.

-DG

David Greenman
Co-founder, The FreeBSD Project - http://www.freebsd.org
President, TeraSolutions, Inc. - http://www.terasolutions.com
President, Download Technologies, Inc. - http://www.downloadtech.com
Pave the road of life with opportunities.

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