linux-kernel - Re: [PATCH RESEND 0/5] Add vhost-blk support

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Date:	Mon, 16 Jul 2012 17:05:02 +0800
From:	Asias He <asias@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Benjamin LaHaise <bcrl@...ck.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jeff Moyer <jmoyer@...hat.com>, kvm@...r.kernel.org,
	linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Zach Brown <zab@...hat.com>
Subject: Re: [PATCH RESEND 0/5] Add vhost-blk support

Hi Christoph,

On 07/14/2012 03:49 PM, Christoph Hellwig wrote:
> Please send a version that does direct block I/O similar to xen-blkback
> for now.

Seems xen-blkback converts the guest IO request to host bio and submit 
them directly. I was wondering whether this has a performance gain 
compared to AIO implementation.

> If we get proper in-kernel aio support one day you can add
> back file backend support.

I talked with Dave and Zack on the in-kernel aio patch which James 
pointed out:

http://marc.info/?l=linux-fsdevel&m=133312234313122

Dave will post a new version soon. I will wait for it.

-- 
Asias


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