[dpdk-dev] [PATCH v1 0/2] one way barrier for split vring idx

[Joyce Kong <joyce.kong@arm.com>]

The similar changes for the packed ring were measured 10% performance
lift and were merged. [1]
In principle, less restrictive barriers generate better performance.
However, no real performance lift was measured with the split ring on
the limited number of existing HW implementations, the reason may be
they are not in the critical path.
To keep consistent with the barrier usage in the packed ring implementation
and be future-proof, we still believe the patches make sense, we are looking
forward to verify the performance when new HWs are available.

[1] https://patchwork.dpdk.org/cover/59283/

Joyce Kong (2):
  virtio: one way barrier for split vring used idx
  virtio: one way barrier for split vring avail idx

 drivers/net/virtio/virtio_ethdev.c            |  9 ++--
 drivers/net/virtio/virtio_ring.h              |  2 +-
 drivers/net/virtio/virtio_rxtx.c              | 46 ++++++++--------
 drivers/net/virtio/virtio_rxtx_simple_neon.c  |  5 +-
 drivers/net/virtio/virtio_rxtx_simple_sse.c   |  5 +-
 .../net/virtio/virtio_user/virtio_user_dev.c  |  8 +--
 drivers/net/virtio/virtqueue.c                |  2 +-
 drivers/net/virtio/virtqueue.h                | 53 ++++++++++++++++---
 lib/librte_vhost/virtio_net.c                 | 19 +++----
 9 files changed, 90 insertions(+), 59 deletions(-)

-- 
2.17.1