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

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Message-ID: <20120618101349.GC23134@redhat.com>
Date:	Mon, 18 Jun 2012 13:13:49 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Asias He <asias@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	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, Jun 18, 2012 at 04:03:23PM +0800, Asias He 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.

OK I guess but then it should be per-device. There could be
a mix of slow and fast disks :)

> -- 
> Asias
> 
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