[dpdk-dev] [PATCH 0/7] support VIRTIO_F_IN_ORDER feature

[Liu, Yong]

 Sorry, add missing loopback performance comparison.

    +---------+----------+----------------+----------------+
    |Loopback |1 Queue   |2 Queues        |4 Queues        |
    +---------+----------+----------------+----------------+
    |Inorder  |6.2Mpps   |9.5 ~ 11.9Mpps  |10.6 ~ 11.3Mpps |
    +---------+----------+----------------+----------------+
    |Normal   |7.5Mpps   |7.7 ~ 9.0Mpps   |7.6 ~ 7.8Mpps   |
    +---------+----------+----------------+----------------+

Thanks,
Marvin

> -----Original Message-----
> From: Liu, Yong
> Sent: Friday, June 08, 2018 5:07 PM
> To: maxime.coquelin at redhat.com; Bie, Tiwei <tiwei.bie at intel.com>
> Cc: Wang, Zhihong <zhihong.wang at intel.com>; dev at dpdk.org; Liu, Yong
> <yong.liu at intel.com>
> Subject: [PATCH 0/7] support VIRTIO_F_IN_ORDER feature
> 
> In latest virtio-spec, new feature bit VIRTIO_F_IN_ORDER was introduced.
> When this feature has been negotiated, virtio driver will use
> descriptors in ring order: starting from offset 0 in the table, and
> wrapping around at the end of the table. Vhost devices will always use
> descriptors in the same order in which they have been made available.
> This can simplify vhost and device code as desc/used/avail ring are
> using same index.
> 
> Based on updated virtio-spec, this series realized IN_ORDER prototype
> in virtio driver. Due to new [RT]x path added into selection, also add
> two new parameters mrg_rx and in_order into virtio-user vdev parameters
> list. This will allow user to configure feature bits thus can impact
> [RT]x path selection.
> 
> IN_ORDER can improve virtio/vhost performance. This patch implement
> virtio driver part only, we can see significant gain there. As a result
> it impacts vhost performance a little since there’s no dedicated Rx/Tx
> implementation on vhost side. This can be added in another patch later.
> 
> Performance of virtio user with IN_ORDER feature:
> 
>     Platform: Purely
>     CPU: Intel(R) Xeon(R) Platinum 8160 CPU @ 2.10GHz
>     DPDK baseline: 18.05
>     Setup: testpmd with vhost vdev + testpmd with virtio vdev
> 
>     +--------------+----------+----------+---------+
>     |Vhost->Virtio |1 Queue   |2 Queues  |4 Queues |
>     +--------------+----------+----------+---------+
>     |Inorder       |12.9Mpps  |25.4Mpps  |31.6Mpps |
>     |Normal        |12.1Mpps  |18.5Mpps  |18.9Mpps |
>     +--------------+----------+----------+---------+
> 
>     +--------------+----------+----------------+---------+
>     |Virtio->Vhost |1 Queue   |2 Queues        |4 Queues |
>     +--------------+----------+----------------+---------+
>     |Inorder       |16.4Mpps  |11.9 ~ 19.5Mpps |11.8Mpps |
>     |Normal        |13.3Mpps  |9.8 ~ 14Mpps    |10.5Mpps |
>     +--------------+----------+----------------+---------+
> 
>     +---------+----------+----------------+----------------+
>     |Loopback |1 Queue   |2 Queues        |4 Queues        |
>     +---------+----------+----------------+----------------+
>     |Inorder  |6.2Mpps   |9.5 ~ 11.9Mpps  |10.6 ~ 11.3Mpps |
>     +---------+----------+----------------+----------------+
> 
> Marvin Liu (7):
>   vhost: announce VIRTIO_F_IN_ORDER support
>   net/virtio: add VIRTIO_F_IN_ORDER definition
>   net/virtio-user: add mgr_rxbuf and in_order vdev parameters
>   net/virtio: free IN_ORDER descriptors
>   net/virtio: support IN_ORDER Rx and Tx
>   net/virtio: add IN_ORDER Rx/Tx into selection
>   net/virtio: annouce VIRTIO_F_IN_ORDER support
> 
>  drivers/net/virtio/virtio_ethdev.c            |  31 +-
>  drivers/net/virtio/virtio_ethdev.h            |   7 +
>  drivers/net/virtio/virtio_pci.h               |   8 +
>  drivers/net/virtio/virtio_rxtx.c              | 618 ++++++++++++++++--
>  .../net/virtio/virtio_user/virtio_user_dev.c  |  10 +-
>  .../net/virtio/virtio_user/virtio_user_dev.h  |   3 +-
>  drivers/net/virtio/virtio_user_ethdev.c       |  33 +-
>  drivers/net/virtio/virtqueue.c                |   8 +
>  drivers/net/virtio/virtqueue.h                |   2 +
>  lib/librte_vhost/socket.c                     |   4 +
>  lib/librte_vhost/vhost.h                      |  10 +-
>  11 files changed, 668 insertions(+), 66 deletions(-)
> 
> --
> 2.17.0