linux-kernel - Re: [RFC PATCH V2 0/8] Packed ring for vhost

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Message-ID: <1529f62d-dc16-d279-2ebf-85a6d2029ebe@redhat.com>
Date:   Mon, 26 Mar 2018 11:44:26 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, virtualization@...ts.linux-foundation.org
Cc:     kvm@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tiwei Bie <tiwei.bie@...el.com>,
        Jens Freimann <jfreimann@...hat.com>, Wei Xu <wexu@...hat.com>
Subject: Re: [RFC PATCH V2 0/8] Packed ring for vhost

cc Jens, Tiwei and Wei

Thanks


On 2018年03月26日 11:38, Jason Wang wrote:
> Hi all:
>
> This RFC implement packed ring layout. The code were tested with pmd
> implement by Jens at
> http://dpdk.org/ml/archives/dev/2018-January/089417.html. Minor change
> was needed for pmd codes to kick virtqueue since it assumes a busy
> polling backend.
>
> Test were done between localhost and guest. Testpmd (rxonly) in guest
> reports 2.4Mpps. Testpmd (txonly) repots about 2.1Mpps.
>
> Notes: The event suppression /indirect descriptor support is complied
>         test only because of lacked driver support.
>
> Changes from V1:
>
> - Refactor vhost used elem code to avoid open coding on used elem
> - Event suppression support (compile test only).
> - Indirect descriptor support (compile test only).
> - Zerocopy support.
> - vIOMMU support.
> - SCSI/VSOCK support (compile test only).
> - Fix several bugs
>
> For simplicity, I don't implement batching or other optimizations.
>
> Please review.
>
> Thanks
>
> Jason Wang (8):
>    vhost: move get_rx_bufs to vhost.c
>    vhost: hide used ring layout from device
>    vhost: do not use vring_used_elem
>    vhost_net: do not explicitly manipulate vhost_used_elem
>    vhost: vhost_put_user() can accept metadata type
>    virtio: introduce packed ring defines
>    vhost: packed ring support
>    vhost: event suppression for packed ring
>
>   drivers/vhost/net.c                | 138 ++-----
>   drivers/vhost/scsi.c               |  62 +--
>   drivers/vhost/vhost.c              | 818 ++++++++++++++++++++++++++++++++++---
>   drivers/vhost/vhost.h              |  46 ++-
>   drivers/vhost/vsock.c              |  42 +-
>   include/uapi/linux/virtio_config.h |   9 +
>   include/uapi/linux/virtio_ring.h   |  32 ++
>   7 files changed, 921 insertions(+), 226 deletions(-)
>