Re: [PATCH 0/1] vhost: add vhost_blk driver

From: Michael S. Tsirkin
Date: Fri Nov 02 2018 - 14:26:04 EST


On Fri, Nov 02, 2018 at 06:21:22PM +0000, 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


Thanks!
Before merging this, I'd like to get some acks from userspace that it's
actually going to be used - e.g. QEMU block maintainers.

> 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
>
> --
> 2.17.1