linux-kernel - Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device

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Date:	Mon, 1 Aug 2011 04:12:01 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Liu Yuan <namei.unix@...il.com>
Cc:	Badari Pulavarty <pbadari@...ibm.com>,
	Stefan Hajnoczi <stefanha@...il.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Avi Kivity <avi@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Khoa Huynh <khoa@...ibm.com>
Subject: Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block
 device

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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