[dpdk-dev] [RFC PATCH 0/2] virtio: one way barrier for packed vring flags

Joyce Kong joyce.kong at arm.com
Tue Aug 27 10:19:37 CEST 2019


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

By doing vhost-user + virtio-user case benchmarking, 9% performance gain
in the RFC2544 test was measured on Thunderx2 platform.[1]

[1]https://doc.dpdk.org/dts/test_plans/pvp_multi_paths_performance_test_plan.html
   PVP test with virtio 1.1 mergeable path

Joyce Kong (2):
  virtio: one way barrier for packed vring desc avail flags
  virtio: one way barrier for packed vring desc used flags

 drivers/net/virtio/virtio_rxtx.c                 | 38 ++++++++++++++++++------
 drivers/net/virtio/virtio_user/virtio_user_dev.c | 10 +++++--
 drivers/net/virtio/virtqueue.h                   |  7 ++++-
 lib/librte_vhost/vhost.h                         |  2 +-
 lib/librte_vhost/virtio_net.c                    | 16 +++++-----
 5 files changed, 50 insertions(+), 23 deletions(-)

-- 
2.7.4



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