[dpdk-dev] [PATCH v2 0/2] one way barrier for split vring idx

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

This patch set replaces the two-way barriers with C11 one-way barriers
for split vring idx, when the frontend and backend are implemented
in software.

By doing PVP benchmarking, the test result showed the throughput increased
20% with the 0.001% of acceptable loss rate on Thunderx2 platform.[1]

By doing vhost-user + virtio-user case benchmarking, 4% performance gain
in the RFC2544 test of 0.001% of acceptable loss rate was measured on
Thunderx2 platform.[2]

[1]https://doc.dpdk.org/guides/howto/pvp_reference_benchmark.html
[2]https://doc.dpdk.org/dts/test_plans/pvp_multi_paths_performance_test_plan.html
   PVP test with virtio 1.0 normal path

v2:
Add test performance statistics.

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