Re: [Qemu-devel] Re: [PATCH 1/3] Refactor AIO interface to allow other AIO implementations

[Jamie Lokier <jamie@shareable.org>]

Anthony Liguori wrote:
> >I'm of the view that '-aio auto' would be a really good option - and
> >when it's proven itself, it should be the default.  It could work on
> >all QEMU hosts: it would pick synchronous IO when there is nothing else.
> 
> Right now, not specifying the -aio option is equivalent to your proposed 
> -aio auto.
> 
> I guess I should include an info aio to let the user know what type of 
> aio they are using.  We can add selection criteria later but 
> semantically, not specifying an explicit -aio option allows QEMU to 
> choose whichever one it thinks is best.

Great.  I guess the next step is to add selection criteria, otherwise
a million Wikis will tell everyone to use '-aio linux' :-)

Do you know what the selection criteria should be - or is there a
document/paper somewhere which says (ideally from benchmarks)?  I'm
interested for an unrelated project using AIO - so I'm willing to help
get this right to some extent.

-- Jamie

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