Re: [PATCH 3/3] virtio-blk: Add bio-based IO path for virtio-blk
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From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2012-06-18 10:14:01
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On Mon, Jun 18, 2012 at 04:03:23PM +0800, Asias He wrote:
On 06/18/2012 03:46 PM, Rusty Russell wrote:quoted
On Mon, 18 Jun 2012 14:53:10 +0800, Asias He [off-list ref] wrote:quoted
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