Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio blockdevice

[Christoph Hellwig]

On Mon, Aug 01, 2011 at 01:46:33PM +0800, Liu Yuan wrote:
> >- I focused on using vfs interfaces in the kernel, so that I can
> >use it for file-backed devices.
> >Our use-case scenario is mostly file-backed images.
> >
> vhost-blk's that uses Linux AIO also support file-backed images.
> Actually, I have run Guests both on raw partition and raw file
> images.

Note tjat it will only perform very well for preallocated images (just
like aio=native in qemu) - if you use sparse images it will have to
call into the allocator, which blocks for metadata I/O even in aio mode.

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