mbox series

[v3,0/2] virtio: one way barrier for packed vring flags

Message ID 1568020491-52462-1-git-send-email-joyce.kong@arm.com (mailing list archive)
Headers
Series virtio: one way barrier for packed vring flags |

Message

Joyce Kong Sept. 9, 2019, 9:14 a.m. UTC 
  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

v3:
Wrap C11 one-way barriers and DMA barriers(rte_cio_*) together with an inline fuction.

v2:
Convert RFC to patch.

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                 | 25 +++++++++++++--------
 drivers/net/virtio/virtio_user/virtio_user_dev.c | 10 ++++++---
 drivers/net/virtio/virtqueue.h                   | 28 +++++++++++++++++++++++-
 lib/librte_vhost/vhost.h                         |  2 +-
 lib/librte_vhost/virtio_net.c                    | 16 ++++++--------
 5 files changed, 58 insertions(+), 23 deletions(-)