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> In-Reply-To: <E16FgRu-0004rm-00@gadolinium.btinternet.com>; from dominic_marks@btinternet.com on Sun, Dec 16, 2001 at 06:56:00PM %2B0000 References: <Pine.LNX.4.30.0112161933200.5821-100000@mustard.heime.net> <E16FgRu-0004rm-00@gadolinium.btinternet.com>
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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. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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