Re: [RFC] vhost-blk implementation

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On Thu, Mar 25, 2010 at 08:29:03AM +0200, Avi Kivity wrote:
> We still have a virtio implementation in userspace for file-based images.
>
> In any case, the file APIs are not asynchronous so we'll need a thread  
> pool.  That will probably minimize the difference in performance between  
> the userspace and kernel implementations.

The kernel has "real" aio when doing direct I/O, although currently we
can't easily use it from kernelspace.  Thejre's a few people who've been
looking into making it usable for that, though.

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