From: Jason Wang <jasowang@redhat.com>
To: Vitaly Mayatskikh <v.mayatskih@gmail.com>,
"Michael S . Tsirkin" <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [PATCH 0/1] vhost: add vhost_blk driver
Date: Mon, 5 Nov 2018 11:00:23 +0800 [thread overview]
Message-ID: <6a7f1668-bf2d-0caa-2efd-c8fab5f1db24@redhat.com> (raw)
In-Reply-To: <20181102182123.29420-1-v.mayatskih@gmail.com>
On 2018/11/3 上午2:21, Vitaly Mayatskikh wrote:
> vhost_blk is a host-side kernel mode accelerator for virtio-blk. The
> driver allows VM to reach a near bare-metal disk performance. See IOPS
> numbers below (fio --rw=randread --bs=4k).
>
> This implementation uses kiocb interface. It is slightly slower than
> going directly through bio, but is simpler and also works with disk
> images placed on a file system.
>
> # fio num-jobs
> # A: bare metal over block
> # B: bare metal over file
> # C: virtio-blk over block
> # D: virtio-blk over file
> # E: vhost-blk bio over block
> # F: vhost-blk kiocb over block
> # G: vhost-blk kiocb over file
> #
> # A B C D E F G
>
> 1 171k 151k 148k 151k 195k 187k 175k
> 2 328k 302k 249k 241k 349k 334k 296k
> 3 479k 437k 179k 174k 501k 464k 404k
> 4 622k 568k 143k 183k 620k 580k 492k
> 5 755k 697k 136k 128k 737k 693k 579k
> 6 887k 808k 131k 120k 830k 782k 640k
> 7 1004k 926k 126k 131k 926k 863k 693k
> 8 1099k 1015k 117k 115k 1001k 931k 712k
> 9 1194k 1119k 115k 111k 1055k 991k 711k
> 10 1278k 1207k 109k 114k 1130k 1046k 695k
> 11 1345k 1280k 110k 108k 1119k 1091k 663k
> 12 1411k 1356k 104k 106k 1201k 1142k 629k
> 13 1466k 1423k 106k 106k 1260k 1170k 607k
> 14 1517k 1486k 103k 106k 1296k 1179k 589k
> 15 1552k 1543k 102k 102k 1322k 1191k 571k
> 16 1480k 1506k 101k 102k 1346k 1202k 566k
>
> Vitaly Mayatskikh (1):
> Add vhost_blk driver
>
> drivers/vhost/Kconfig | 13 ++
> drivers/vhost/Makefile | 3 +
> drivers/vhost/blk.c | 510 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 526 insertions(+)
> create mode 100644 drivers/vhost/blk.c
>
Hi:
Thanks for the patches.
This is not the first attempt for having vhost-blk:
- Badari's version: https://lwn.net/Articles/379864/
- Asias' version: https://lwn.net/Articles/519880/
It's better to describe the differences (kiocb vs bio? performance?).
E.g if my memory is correct, Asias said it doesn't give much improvement
compared with userspace qemu.
And what's more important, I believe we tend to use virtio-scsi nowdays.
So what's the advantages of vhost-blk over vhost-scsi?
Thanks
next prev parent reply other threads:[~2018-11-05 3:00 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-02 18:21 [PATCH 0/1] vhost: add vhost_blk driver Vitaly Mayatskikh
2018-11-02 18:21 ` [PATCH 1/1] Add " Vitaly Mayatskikh
2018-11-02 18:36 ` Michael S. Tsirkin
2018-11-02 19:24 ` Vitaly Mayatskih
2018-11-02 20:38 ` Michael S. Tsirkin
2018-11-03 2:50 ` kbuild test robot
2018-11-06 16:03 ` Stefan Hajnoczi
2018-11-06 19:47 ` Vitaly Mayatskih
2018-11-02 18:26 ` [PATCH 0/1] vhost: add " Michael S. Tsirkin
2018-11-02 18:31 ` Vitaly Mayatskih
2018-11-05 14:02 ` Christian Borntraeger
2018-11-05 14:21 ` Vitaly Mayatskih
2018-11-06 15:40 ` Stefan Hajnoczi
2018-11-06 18:46 ` Denis Lunev
2018-11-06 20:08 ` Vitaly Mayatskih
2018-11-04 11:57 ` Maxim Levitsky
2018-11-04 16:40 ` Vitaly Mayatskih
2018-11-05 11:55 ` Maxim Levitsky
2018-11-05 3:00 ` Jason Wang [this message]
2018-11-05 3:23 ` Vitaly Mayatskih
2018-11-06 2:45 ` Jason Wang
2018-11-06 2:56 ` Vitaly Mayatskih
2018-11-06 7:13 ` Christoph Hellwig
2018-11-06 21:41 ` Paolo Bonzini
2018-11-05 15:48 ` Christian Borntraeger
2018-11-05 16:15 ` Vitaly Mayatskih
2018-11-06 15:21 ` Stefan Hajnoczi
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