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Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target |
Date: |
Sat, 21 Nov 2015 14:11:49 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 20/11/2015 01:20, Ming Lin wrote:
> One improvment could be to use google's NVMe vendor extension that
> I send in another thread, aslo here:
> https://git.kernel.org/cgit/linux/kernel/git/mlin/linux.git/log/?h=nvme-google-ext
>
> Qemu side:
> http://www.minggr.net/cgit/cgit.cgi/qemu/log/?h=vhost-nvme.0
> Kernel side also here:
> https://git.kernel.org/cgit/linux/kernel/git/mlin/linux.git/log/?h=vhost-nvme.0
How much do you get with vhost-nvme plus vendor extension, compared to
190 MB/s for QEMU?
Note that in all likelihood, QEMU can actually do better than 190 MB/s,
and gain more parallelism too, by moving the processing of the
ioeventfds to a separate thread. This is similar to
hw/block/dataplane/virtio-blk.c.
It's actually pretty easy to do. Even though
hw/block/dataplane/virtio-blk.c is still using some old APIs, all memory
access in QEMU is now thread-safe. I have pending patches for 2.6 that
cut that file down to a mere 200 lines of code, NVMe would probably be
about the same.
Paolo
- Re: [Qemu-devel] [RFC PATCH 4/9] nvmet: add a controller "start" hook, (continued)
- [Qemu-devel] [RFC PATCH 1/9] nvme-vhost: add initial commit, Ming Lin, 2015/11/19
- [Qemu-devel] [RFC PATCH 5/9] nvme-vhost: add controller "start" callback, Ming Lin, 2015/11/19
- [Qemu-devel] [RFC PATCH 3/9] nvme-vhost: add basic nvme bar read/write, Ming Lin, 2015/11/19
- [Qemu-devel] [RFC PATCH 7/9] nvme-vhost: add "parse_extra_admin_cmd" callback, Ming Lin, 2015/11/19
- [Qemu-devel] [RFC PATCH 6/9] nvmet: add a "parse_extra_admin_cmd" hook, Ming Lin, 2015/11/19
- [Qemu-devel] [RFC PATCH 8/9] nvme-vhost: add vhost memory helpers, Ming Lin, 2015/11/19
- [Qemu-devel] [RFC PATCH 9/9] nvme-vhost: add nvme queue handlers, Ming Lin, 2015/11/19
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Christoph Hellwig, 2015/11/20
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target,
Paolo Bonzini <=
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Ming Lin, 2015/11/23
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Paolo Bonzini, 2015/11/23
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Ming Lin, 2015/11/24
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Ming Lin, 2015/11/24
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Paolo Bonzini, 2015/11/24
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Ming Lin, 2015/11/24
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Paolo Bonzini, 2015/11/25
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Ming Lin, 2015/11/25
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Paolo Bonzini, 2015/11/25
- Re: [Qemu-devel] [RFC PATCH 0/9] vhost-nvme: new qemu nvme backend using nvme target, Ming Lin, 2015/11/30