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From: Paolo Bonzini <pbonzini@redhat.com>
To: Ming Lin <mlin@kernel.org>
Cc: qemu-devel@nongnu.org, Christoph Hellwig <hch@lst.de>,
	linux-nvme@lists.infradead.org,
	virtualization@lists.linux-foundation.org
Subject: Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target
Date: Tue, 1 Dec 2015 11:59:06 -0500 (EST)	[thread overview]
Message-ID: <998355860.30506151.1448989146641.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <1448987171.3041.2.camel@hasee>


> What do you think about virtio-nvme+vhost-nvme?

What would be the advantage over virtio-blk?  Multiqueue is not supported
by QEMU but it's already supported by Linux (commit 6a27b656fc).

To me, the advantage of nvme is that it provides more than decent performance on
unmodified Windows guests, and thanks to your vendor extension can be used
on Linux as well with speeds comparable to virtio-blk.  So it's potentially
a very good choice for a cloud provider that wants to support Windows guests
(together with e.g. a fast SAS emulated controller to replace virtio-scsi,
and emulated igb or ixgbe to replace virtio-net).

Which features are supported by NVMe and not virtio-blk?

Paolo

> I also have patch for vritio-nvme:
> https://git.kernel.org/cgit/linux/kernel/git/mlin/linux.git/log/?h=nvme-split/virtio
> 
> Just need to change vhost-nvme to work with it.
> 
> > 
> > Paolo
> > 
> > > Still tuning.
> 
> 
> 

  reply	other threads:[~2015-12-01 16:59 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-20  0:20 [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target Ming Lin
2015-11-20  0:21 ` [Qemu-devel] [RFC PATCH 1/9] nvme-vhost: add initial commit Ming Lin
2015-11-20  0:21 ` [Qemu-devel] [RFC PATCH 2/9] nvme-vhost: add basic ioctl handlers Ming Lin
2015-11-20  0:21 ` [Qemu-devel] [RFC PATCH 3/9] nvme-vhost: add basic nvme bar read/write Ming Lin
2015-11-20  0:21 ` [Qemu-devel] [RFC PATCH 4/9] nvmet: add a controller "start" hook Ming Lin
2015-11-20  5:13   ` Christoph Hellwig
2015-11-20  5:31     ` Ming Lin
2015-11-20  0:21 ` [Qemu-devel] [RFC PATCH 5/9] nvme-vhost: add controller "start" callback Ming Lin
2015-11-20  0:21 ` [Qemu-devel] [RFC PATCH 6/9] nvmet: add a "parse_extra_admin_cmd" hook Ming Lin
2015-11-20  0:21 ` [Qemu-devel] [RFC PATCH 7/9] nvme-vhost: add "parse_extra_admin_cmd" callback Ming Lin
2015-11-20  0:21 ` [Qemu-devel] [RFC PATCH 8/9] nvme-vhost: add vhost memory helpers Ming Lin
2015-11-20  0:21 ` [Qemu-devel] [RFC PATCH 9/9] nvme-vhost: add nvme queue handlers Ming Lin
2015-11-20  5:16 ` [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target Christoph Hellwig
2015-11-20  5:33   ` Ming Lin
2015-11-21 13:11 ` Paolo Bonzini
2015-11-23  8:17   ` Ming Lin
2015-11-23 14:14     ` Paolo Bonzini
2015-11-24  7:27       ` Ming Lin
2015-11-24  8:23         ` Ming Lin
2015-11-24 10:51         ` Paolo Bonzini
2015-11-24 19:25           ` Ming Lin
2015-11-25 11:27             ` Paolo Bonzini
2015-11-25 18:51               ` Ming Lin
2015-11-25 19:32                 ` Paolo Bonzini
2015-11-30 23:20       ` Ming Lin
2015-12-01 16:02         ` Paolo Bonzini
2015-12-01 16:26           ` Ming Lin
2015-12-01 16:59             ` Paolo Bonzini [this message]
2015-12-02  5:13               ` Ming Lin
2015-12-02 10:07                 ` Paolo Bonzini

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