From: Paolo Bonzini <pbonzini@redhat.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Hannes Reinecke <hare@suse.de>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
qemu-devel <qemu-devel@nongnu.org>,
Rusty Russell <rusty@rustcorp.com.au>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
Christoph Hellwig <chellwig@redhat.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: 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
WARNING: multiple messages have this Message-ID (diff)
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 10:07 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-07 13:43 virtio scsi host draft specification, v3 Paolo Bonzini
2011-06-07 13:43 ` [Qemu-devel] " Paolo Bonzini
2011-06-08 23:28 ` Rusty Russell
2011-06-08 23:28 ` Rusty Russell
2011-06-08 23:28 ` [Qemu-devel] " Rusty Russell
2011-06-08 23:28 ` Rusty Russell
2011-06-09 6:59 ` Paolo Bonzini
2011-06-09 6:59 ` [Qemu-devel] " Paolo Bonzini
2011-06-10 11:33 ` Rusty Russell
2011-06-10 11:33 ` Rusty Russell
2011-06-10 11:33 ` [Qemu-devel] " Rusty Russell
2011-06-10 12:14 ` Stefan Hajnoczi
2011-06-10 12:14 ` Stefan Hajnoczi
2011-06-10 12:14 ` [Qemu-devel] " Stefan Hajnoczi
2011-06-10 12:22 ` Paolo Bonzini
2011-06-10 12:22 ` Paolo Bonzini
2011-06-10 12:22 ` [Qemu-devel] " Paolo Bonzini
2011-06-09 6:59 ` Paolo Bonzini
2011-06-10 12:55 ` Hannes Reinecke
2011-06-10 12:55 ` [Qemu-devel] " Hannes Reinecke
2011-06-10 14:35 ` Paolo Bonzini
2011-06-10 14:35 ` [Qemu-devel] " Paolo Bonzini
2011-06-14 8:39 ` Hannes Reinecke
2011-06-14 8:39 ` [Qemu-devel] " Hannes Reinecke
2011-06-14 15:53 ` Stefan Hajnoczi
2011-06-14 15:53 ` [Qemu-devel] " Stefan Hajnoczi
2011-06-14 15:53 ` Stefan Hajnoczi
2011-06-29 8:33 ` Paolo Bonzini
2011-06-29 8:33 ` [Qemu-devel] " Paolo Bonzini
2011-06-29 9:39 ` Stefan Hajnoczi
2011-06-29 9:39 ` Stefan Hajnoczi
2011-06-29 9:39 ` [Qemu-devel] " Stefan Hajnoczi
2011-06-29 10:07 ` Christoph Hellwig
2011-06-29 10:07 ` Christoph Hellwig
2011-06-29 10:07 ` [Qemu-devel] " Christoph Hellwig
2011-06-29 10:23 ` Hannes Reinecke
2011-06-29 10:23 ` [Qemu-devel] " Hannes Reinecke
2011-06-29 10:27 ` Christoph Hellwig
2011-06-29 10:27 ` [Qemu-devel] " Christoph Hellwig
2011-06-29 10:27 ` Christoph Hellwig
2011-06-29 10:23 ` Hannes Reinecke
2011-07-01 6:41 ` Paolo Bonzini
2011-07-01 6:41 ` Paolo Bonzini
2011-07-01 6:41 ` [Qemu-devel] " Paolo Bonzini
2011-07-01 7:14 ` Hannes Reinecke
2011-07-01 7:14 ` Hannes Reinecke
2011-07-01 7:14 ` [Qemu-devel] " Hannes Reinecke
2011-07-01 8:35 ` Paolo Bonzini
2011-07-01 8:35 ` [Qemu-devel] " Paolo Bonzini
2011-07-04 13:38 ` Hai Dong,Li
2011-07-04 13:38 ` Hai Dong,Li
2011-07-04 13:38 ` [Qemu-devel] " Hai Dong,Li
2011-07-04 14:22 ` Stefan Hajnoczi
2011-07-04 14:22 ` [Qemu-devel] " Stefan Hajnoczi
2011-07-04 14:22 ` Stefan Hajnoczi
2011-07-01 8:35 ` Paolo Bonzini
2011-06-29 8:33 ` Paolo Bonzini
2011-06-14 8:39 ` Hannes Reinecke
2011-06-10 14:35 ` Paolo Bonzini
2011-06-12 7:51 ` Michael S. Tsirkin
2011-06-12 7:51 ` Michael S. Tsirkin
2011-06-12 7:51 ` [Qemu-devel] " Michael S. Tsirkin
2011-06-14 15:30 ` Hannes Reinecke
2011-06-14 15:30 ` Hannes Reinecke
2011-06-14 15:30 ` [Qemu-devel] " Hannes Reinecke
2011-06-29 10:00 ` Christoph Hellwig
2011-06-29 10:00 ` Christoph Hellwig
2011-06-29 10:00 ` [Qemu-devel] " Christoph Hellwig
2011-06-29 8:23 ` Paolo Bonzini
2011-06-29 8:23 ` Paolo Bonzini
2011-06-29 8:23 ` [Qemu-devel] " Paolo Bonzini
2011-06-29 8:46 ` Michael S. Tsirkin
2011-06-29 8:46 ` Michael S. Tsirkin
2011-06-29 8:46 ` [Qemu-devel] " Michael S. Tsirkin
2011-06-29 10:03 ` Christoph Hellwig
2011-06-29 10:03 ` [Qemu-devel] " Christoph Hellwig
2011-06-29 10:06 ` Paolo Bonzini
2011-06-29 10:06 ` Paolo Bonzini [this message]
2011-06-29 10:06 ` [Qemu-devel] " Paolo Bonzini
2011-06-29 10:31 ` Michael S. Tsirkin
2011-06-29 10:31 ` Michael S. Tsirkin
2011-06-29 10:31 ` [Qemu-devel] " Michael S. Tsirkin
2011-06-29 10:35 ` Paolo Bonzini
2011-06-29 10:35 ` Paolo Bonzini
2011-06-29 10:35 ` [Qemu-devel] " Paolo Bonzini
2011-06-29 10:03 ` Christoph Hellwig
2011-06-29 10:01 ` Christoph Hellwig
2011-06-29 10:01 ` [Qemu-devel] " Christoph Hellwig
2011-06-29 10:01 ` Christoph Hellwig
2011-06-10 12:55 ` Hannes Reinecke
-- strict thread matches above, loose matches on Subject: below --
2011-06-07 13:43 Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4E0AF925.2050707@redhat.com \
--to=pbonzini@redhat.com \
--cc=chellwig@redhat.com \
--cc=hare@suse.de \
--cc=hch@infradead.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mst@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=rusty@rustcorp.com.au \
--cc=stefanha@linux.vnet.ibm.com \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.