[dpdk-dev] [PATCH v5 0/2] one way barrier for split vring idx

[Joyce Kong]

This patchset 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 of 2c1q 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
was measured on Thunderx2 platform by 2c1q RFC2544 test of 0.001% loss,
and 4.7% performance was improved on Dell platform by 1c1q RFC2544 test
of zero packet loss.[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

v5:
  Fix the compling issue when 'CONFIG_RTE_LIBRTE_VIRTIO_DEBUG_DUMP=y'
  is enabled.

v4:
  Remove some duplicated code comment.

v3:
  Modify some style error.

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            |  7 +--
 drivers/net/virtio/virtio_ring.h              |  2 +-
 drivers/net/virtio/virtio_rxtx.c              | 35 ++++-------
 drivers/net/virtio/virtio_rxtx_simple_neon.c  |  5 +-
 drivers/net/virtio/virtio_rxtx_simple_sse.c   |  4 +-
 .../net/virtio/virtio_user/virtio_user_dev.c  |  8 ++-
 drivers/net/virtio/virtqueue.c                |  2 +-
 drivers/net/virtio/virtqueue.h                | 58 ++++++++++++++++---
 lib/librte_vhost/virtio_net.c                 | 19 +++---
 9 files changed, 81 insertions(+), 59 deletions(-)

-- 
2.17.1