[dpdk-dev] [PATCH v2 0/8] support VIRTIO_F_IN_ORDER feature
Liu, Yong
yong.liu at intel.com
Tue Jun 26 10:01:17 CEST 2018
> -----Original Message-----
> From: Maxime Coquelin [mailto:maxime.coquelin at redhat.com]
> Sent: Tuesday, June 26, 2018 3:56 PM
> To: Liu, Yong <yong.liu at intel.com>; Bie, Tiwei <tiwei.bie at intel.com>
> Cc: Wang, Zhihong <zhihong.wang at intel.com>; dev at dpdk.org
> Subject: Re: [PATCH v2 0/8] support VIRTIO_F_IN_ORDER feature
>
> Hi,
>
> On 06/25/2018 05:17 PM, Marvin Liu wrote:
> > 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 reduce virtio accesses to used ring.
> >
> > 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.
> >
> > 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 |12.0Mpps |24.2Mpps |26.0Mpps |
> > |Normal |12.1Mpps |18.5Mpps |18.9Mpps |
> > +--------------+----------+----------+---------+
> >
> > +--------------+----------+----------------+---------+
> > |Virtio->Vhost |1 Queue |2 Queues |4 Queues |
> > +--------------+----------+----------------+---------+
> > |Inorder |13.8Mpps |10.7 ~ 15.2Mpps |11.5Mpps |
> > |Normal |13.3Mpps |9.8 ~ 14Mpps |10.5Mpps |
> > +--------------+----------+----------------+---------+
> >
> > +---------+----------+----------------+----------------+
> > |Loopback |1 Queue |2 Queues |4 Queues |
> > +---------+----------+----------------+----------------+
> > |Inorder |7.4Mpps |9.1 ~ 11.6Mpps |10.5 ~ 11.3Mpps |
> > +---------+----------+----------------+----------------+
> > |Normal |7.5Mpps |7.7 ~ 9.0Mpps |7.6 ~ 7.8Mpps |
> > +---------+----------+----------------+----------------+
> >
> > v2:
> > - merge to latest dpdk-net-virtio
> > - not use in_direct for normal xmit packets
> > - update available ring for each descriptor
> > - clean up IN_ORDER xmit function
> > - unmask feature bits when disabled in_order or mgr_rxbuf
> > - extract common part between IN_ORDER and normal functions
> > - update performance result
> >
> > Marvin Liu (8):
> > vhost: announce VIRTIO_F_IN_ORDER support
> > net/virtio: add VIRTIO_F_IN_ORDER definition
> > net/virtio-user: add mrg_rxbuf and in_order vdev parameters
> > net/virtio: free IN_ORDER descriptors before device start
> > net/virtio: extract common part for IN_ORDER functions
> > 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
>
> I haven't checked but guess the titles doesn't pass the check-git-log.sh
> script as they contains underscores.
Thanks for your reminder, Maxime. I will replace "IN_ORDER" to "in order" which can pass check.
>
> > 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 | 635 ++++++++++++++++--
> > .../net/virtio/virtio_user/virtio_user_dev.c | 14 +-
> > .../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 | 6 +
> > lib/librte_vhost/vhost.h | 10 +-
> > 11 files changed, 688 insertions(+), 69 deletions(-)
> >
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