Date: Mon, 06 Mar 2006 19:11:20 -0800 (PST)
Message-Id: <20060306.191120.58661202.davem@davemloft.net>
To: bcrl@kvack.org
Cc: da-x@monatomic.org, drepper@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: Status of AIO
From: "David S. Miller" <davem@davemloft.net>
In-Reply-To: <20060307020736.GW20768@kvack.org>
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	<20060307020736.GW20768@kvack.org>
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From: Benjamin LaHaise <bcrl@kvack.org>
Date: Mon, 6 Mar 2006 21:07:36 -0500

> On Tue, Mar 07, 2006 at 04:04:11AM +0200, Dan Aloni wrote:
> > This somehow resembles the scatter-gatter lists already used in some 
> > subsystems such as the SCSI sg driver. 
> 
> None of the iovecs are particularly special.  What's special here is that 
> particulars of the container make the fast path *cheap*.

Please read Druschel and Peterson's paper on fbufs and any followon
work before going down this path.  Fbufs are exactly what you are
proposing as a workaround for the VM cost of page flipping, and the
idea has been around since 1993. :-)

As I mentioned Chapter 5 of Networking Algorithmics discusses this
in detail, and also covers many related attempts such as I/O
Lite.
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