From owner-freebsd-questions  Sun Dec 16 13:10:47 2001
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Date: Sun, 16 Dec 2001 13:02:12 -0800
From: David Greenman <dg@root.com>
To: Dominic Marks <dominic_marks@btinternet.com>
Cc: Roy Sigurd Karlsbakk <roy@karlsbakk.net>,
	freebsd-questions@FreeBSD.ORG
Subject: Re: in-kernel web server???
Message-ID: <20011216130212.B88592@nexus.root.com>
References: <Pine.LNX.4.30.0112161933200.5821-100000@mustard.heime.net> <E16FgRu-0004rm-00@gadolinium.btinternet.com>
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In-Reply-To: <E16FgRu-0004rm-00@gadolinium.btinternet.com>; from dominic_marks@btinternet.com on Sun, Dec 16, 2001 at 06:56:00PM +0000
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>On Sunday 16 December 2001 6:36 pm, Roy Sigurd Karlsbakk wrote:
>> > Have you experimented with FTP and NFS copy speeds for
>> > comparison?
>>
>> I can't use them. Currently, I heed to run http.
>>
>> > AFAIK FreeBSD does not support zero copy. There are some patches
>> > floating around but I have no knowledge about them.
>>
>> Are you sure?
>>
>> According to Paal Halvorsen, PhD on 'improving i/o performance on
>> multimedia systems' (see
>> http://ConfMan.unik.no/~paalh/index2.html), he says sendfile() is
>> supported under FreeBSD.
>
>Sendfile is supported. As I understand it being able to do zero copy 
>memory access and using sendfile are not the same thing. Sendfile may 
>be implemented with zero copy, or it may not. I may be wrong with 
>this issue.

   sendfile() in FreeBSD is zero-copy, but you're right that an implementation
of sendfile() need not be zero-copy, and in fact I recall that at least an
early version of sendfile() on Linux was not zero-copy.

-DG

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

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