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(-) -- 2.7.4
