From mboxrd@z Thu Jan  1 00:00:00 1970
From: Asias He <asias@redhat.com>
Subject: Re: [PATCH RESEND 0/5] Add vhost-blk support
Date: Mon, 16 Jul 2012 17:05:02 +0800
Message-ID: <5003D93E.2000304@redhat.com>
References: <1342169711-12386-1-git-send-email-asias@redhat.com> <20120714074911.GA31684@infradead.org>
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Cc: linux-kernel@vger.kernel.org, Alexander Viro <viro@zeniv.linux.org.uk>,
        Benjamin LaHaise <bcrl@kvack.org>,
        James Bottomley <James.Bottomley@HansenPartnership.com>,
        Jeff Moyer <jmoyer@redhat.com>, kvm@vger.kernel.org,
        linux-aio@kvack.org, linux-fsdevel@vger.kernel.org,
        "Michael S. Tsirkin" <mst@redhat.com>,
        virtualization@lists.linux-foundation.org,
        Dave Kleikamp <dave.kleikamp@oracle.com>, Zach Brown <zab@redhat.com>
To: Christoph Hellwig <hch@infradead.org>
Return-path: <owner-linux-aio@kvack.org>
In-Reply-To: <20120714074911.GA31684@infradead.org>
Sender: owner-linux-aio@kvack.org
List-Id: linux-fsdevel.vger.kernel.org

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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