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

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Message-ID: <20120717150928.GB11587@redhat.com>
Date:	Tue, 17 Jul 2012 18:09:28 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Asias He <asias@...hat.com>
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,
	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	lf-virt <virtualization@...ts.linux-foundation.org>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	Zhi Yong Wu <wuzhy@...ibm.com>,
	Anthony Liguori <aliguori@...ux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH RESEND 0/5] Add vhost-blk support

On Fri, Jul 13, 2012 at 04:55:06PM +0800, Asias He wrote:
> 
> Hi folks,
> 
> [I am resending to fix the broken thread in the previous one.]
> 
> This patchset adds vhost-blk support. vhost-blk is a in kernel virito-blk
> device accelerator. Compared to userspace virtio-blk implementation, vhost-blk
> gives about 5% to 15% performance improvement.

Same thing as tcm_host comment:

	It seems not 100% clear whether this driver will have major
	userspace using it. And if not, it would be very hard to support a
	driver when recent userspace does not use it in the end.

	I think a good idea for 3.6 would be to make it depend on
	CONFIG_STAGING.  Then we don't commit to an ABI.  For this, you can add
	a separate Kconfig and source it from drivers/staging/Kconfig.  Maybe it
	needs to be in a separate directory drivers/vhost/staging/Kconfig.

I Cc'd the list of tcm_host in the hope that you can cooperate on this.

-- 
MST
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