linux-kernel - Re: virtio scsi host draft specification, v3

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Message-ID: <4E0AF925.2050707@redhat.com>
Date:	Wed, 29 Jun 2011 12:06:29 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Hannes Reinecke <hare@...e.de>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	qemu-devel <qemu-devel@...gnu.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	Christoph Hellwig <chellwig@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: virtio scsi host draft specification, v3

On 06/29/2011 12:03 PM, Christoph Hellwig wrote:
> >  I agree here, in fact I misread Hannes's comment as "if a driver
> >  uses more than one queue it is responsibility of the driver to
> >  ensure strict request ordering".  If you send requests to different
> >  queues, you know that those requests are independent.  I don't think
> >  anything else is feasible in the virtio framework.
>
> That doesn't really fit very well with the SAM model.  If we want
> to use multiple queues for a single LUN it has to be transparent to
> the SCSI command stream.  Then again I don't quite see the use for
> that anyway.

Agreed, I see a use for multiple queues (MSI-X), but not for multiple 
queues shared by a single LUN.

Paolo
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