Re: [Qemu-devel] [PATCH 2/2] aio: use Linux AIO even if nocache is not specified

[Christoph Hellwig]

On Wed, Jul 27, 2011 at 08:25:26PM +0200, Frediano Ziglio wrote:
> Currently Linux AIO are used only if nocache is specified.
> Linux AIO works in all cases. The only problem is that currently Linux AIO
> does not align data so I add a test that use POSIX AIO in this case.

The kernel will accept buffered I/O requests, and even handle them 100%
correctly.  The only thing it won't do is to handle them asynchronously,
so with your patch you're back to executing I/O synchronously in guest
context.