Re: Status of AIO

[David S. Miller]

From: Benjamin LaHaise <bcrl@xxxxxxxxx>
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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