linux-kernel - Re: [PATCH 0/1] vhost: add vhost

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Message-ID: <CAGF4SLgVoktAqWHKBbcwJ9+efaGnLpmUEohGi4YOKyGrwpY97Q@mail.gmail.com>
Date:   Fri, 2 Nov 2018 14:31:21 -0400
From:   Vitaly Mayatskih <v.mayatskih@...il.com>
To:     "Michael S . Tsirkin" <mst@...hat.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] vhost: add vhost_blk driver

Sure! It needs a new QEMU driver (vhost-blk-pci), I'm preparing it to
be sent out.
On Fri, Nov 2, 2018 at 2:26 PM Michael S. Tsirkin <mst@...hat.com> wrote:
>
> 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



-- 
wbr, Vitaly