On 12/21/20 3:23 PM, Joyce Kong wrote:
> This patchset is to replace rte smp barriers in virtio with C11 atomic
> built-ins.
>
> The rte_smp_*mb APIs provide full barrier functionality. However, many
> use cases do not require full barriers. To support such use cases, DPDK
> will adopt C11 barrier semantics and provide wrappers using C11 atomic
> built-ins.[1]
>
> With this patch set, under 0.001% acceptable loss with 2 cores on vhost
> side and 1 core on virtio side, PVP case(vhost-user + virtio-user) has
> 6.7% perf uplift for the split in_order path on ThunderX2 platform.
>
> [1]
> http://code.dpdk.org/dpdk/latest/source/doc/guides/rel_notes/deprecation.rst
>
> Joyce Kong (4):
> net/virtio: remove unnecessary rmb barrier
> net/virtio: replace smp barrier with IO barrier
> net/virtio: replace full barrier with relaxed barrier for Arm platform
> net/virtio: replace full barrier with thread fence
>
> drivers/net/virtio/virtio_ethdev.c | 10 ++++-----
> drivers/net/virtio/virtqueue.h | 35 +++++++++++++++---------------
> 2 files changed, 22 insertions(+), 23 deletions(-)
>
Series applied to dpdk-next-virtio/main.
Thanks,
Maxime
