linux-kernel - Re: [PATCH 3/3] virtio-blk: Add bio-based IO path for virtio-blk

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Date:	Mon, 18 Jun 2012 19:35:22 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Asias He <asias@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Christoph Hellwig <hch@....de>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH 3/3] virtio-blk: Add bio-based IO path for virtio-blk

On Mon, 18 Jun 2012 16:03:23 +0800, Asias He <asias@...hat.com> wrote:
> On 06/18/2012 03:46 PM, Rusty Russell wrote:
> > On Mon, 18 Jun 2012 14:53:10 +0800, Asias He <asias@...hat.com> wrote:
> >> This patch introduces bio-based IO path for virtio-blk.
> >
> > Why make it optional?
> 
> request-based IO path is useful for users who do not want to bypass the 
> IO scheduler in guest kernel, e.g. users using spinning disk. For users 
> using fast disk device, e.g. SSD device, they can use bio-based IO path.

Users using a spinning disk still get IO scheduling in the host though.
What benefit is there in doing it in the guest as well?

Cheers,
Rusty.
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