Re: [dpdk-dev] [PATCH v4 0/2] one way barrier for split vring idx

[Maxime Coquelin <maxime.coquelin@redhat.com>]

On 4/24/20 5:39 AM, Joyce Kong wrote:
> 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
> 
> 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(-)
> 

Applied to dpdk-next-virtio/master

Thanks,
Maxime