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Date: Tue, 6 Dec 2005 09:31:34 +0300
From: Igor Robul <igorr@speechpro.com>
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Subject: Re: ZERO_COPY_SOCKETS
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On Mon, Dec 05, 2005 at 09:20:28PM -0500, Joshua Coombs wrote:
> #options                ZERO_COPY_SOCKETS
> 
> What's the status of this in 6.0-R and 6-stable?  The idea of avoiding 
> memory copies when possible seems really appealing for my 386, on 
> which any little boost is significant. : )
http://www.freebsd.org/releases/6.0R/relnotes-i386.html#KERNEL

So you can't use FreeBSD-6.0 and greater on 80386 anymore.