This driver moves virtio-blk host-side processing to kernel (via new vhost_blk kernel driver). It accelerates virtual disk performance close to bare metal levels, especially for parellel loads.
For example, fio numjobs=16 gets 101k randread IOPS using virtio-blk and 1202k IOPS using vhost-blk, close to 1480k of raw disk performance. See the IOPS numbers below. The kernel part if you want to try: - vhost_blk: https://lkml.org/lkml/2018/11/2/648 - vhost num-queues scalability fix: https://lkml.org/lkml/2018/11/2/550 # 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 over block # F: vhost-blk over file # # A B C D E F 1 171k 151k 148k 151k 187k 175k 2 328k 302k 249k 241k 334k 296k 3 479k 437k 179k 174k 464k 404k 4 622k 568k 143k 183k 580k 492k 5 755k 697k 136k 128k 693k 579k 6 887k 808k 131k 120k 782k 640k 7 1004k 926k 126k 131k 863k 693k 8 1099k 1015k 117k 115k 931k 712k 9 1194k 1119k 115k 111k 991k 711k 10 1278k 1207k 109k 114k 1046k 695k 11 1345k 1280k 110k 108k 1091k 663k 12 1411k 1356k 104k 106k 1142k 629k 13 1466k 1423k 106k 106k 1170k 607k 14 1517k 1486k 103k 106k 1179k 589k 15 1552k 1543k 102k 102k 1191k 571k 16 1480k 1506k 101k 102k 1202k 566k Vitaly Mayatskikh (1): Add vhost-pci-blk driver configure | 10 +++++++ default-configs/virtio.mak | 1 + hw/block/Makefile.objs | 1 + hw/virtio/virtio-pci.c | 60 ++++++++++++++++++++++++++++++++++++++ hw/virtio/virtio-pci.h | 19 ++++++++++++ 5 files changed, 91 insertions(+) -- 2.17.1
