From: Paolo Bonzini <pbonzini@redhat.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Christoph Hellwig <chellwig@redhat.com>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Rusty Russell <rusty@rustcorp.com.au>,
qemu-devel <qemu-devel@nongnu.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Hannes Reinecke <hare@suse.de>,
Linux Virtualization <virtualization@lists.linux-foundation.org>
Subject: Re: [Qemu-devel] virtio scsi host draft specification, v3
Date: Wed, 29 Jun 2011 12:06:29 +0200 [thread overview]
Message-ID: <4E0AF925.2050707@redhat.com> (raw)
In-Reply-To: <20110629100341.GC22900@infradead.org>
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
next prev parent reply other threads:[~2011-06-29 10:06 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-07 13:43 [Qemu-devel] virtio scsi host draft specification, v3 Paolo Bonzini
2011-06-08 23:28 ` Rusty Russell
2011-06-09 6:59 ` Paolo Bonzini
2011-06-10 11:33 ` Rusty Russell
2011-06-10 12:14 ` Stefan Hajnoczi
2011-06-10 12:22 ` Paolo Bonzini
2011-06-10 12:55 ` Hannes Reinecke
2011-06-10 14:35 ` Paolo Bonzini
2011-06-14 8:39 ` Hannes Reinecke
2011-06-14 15:53 ` Stefan Hajnoczi
2011-06-29 8:33 ` Paolo Bonzini
2011-06-29 9:39 ` Stefan Hajnoczi
2011-06-29 10:07 ` Christoph Hellwig
2011-06-29 10:23 ` Hannes Reinecke
2011-06-29 10:27 ` Christoph Hellwig
2011-07-01 6:41 ` Paolo Bonzini
2011-07-01 7:14 ` Hannes Reinecke
2011-07-01 8:35 ` Paolo Bonzini
2011-07-04 13:38 ` Hai Dong,Li
2011-07-04 14:22 ` Stefan Hajnoczi
2011-06-12 7:51 ` Michael S. Tsirkin
2011-06-14 15:30 ` Hannes Reinecke
2011-06-29 10:00 ` Christoph Hellwig
2011-06-29 8:23 ` Paolo Bonzini
2011-06-29 8:46 ` Michael S. Tsirkin
2011-06-29 10:03 ` Christoph Hellwig
2011-06-29 10:06 ` Paolo Bonzini [this message]
2011-06-29 10:31 ` Michael S. Tsirkin
2011-06-29 10:35 ` Paolo Bonzini
2011-06-29 10:01 ` Christoph Hellwig
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