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

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