Re: [dpdk-dev] [PATCH v4 2/2] mempool/ring: add support for new ring sync modes

[Thomas Monjalon <thomas@monjalon.net>]

13/07/2020 17:50, Konstantin Ananyev:
> Two new sync modes were introduced into rte_ring:
> relaxed tail sync (RTS) and head/tail sync (HTS).
> This change provides user with ability to select these
> modes for ring based mempool via mempool ops API.
> 
> Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> Acked-by: Gage Eads <gage.eads@intel.com>
> ---
>  doc/guides/mempool/ring.rst             | 10 +++
>  doc/guides/rel_notes/release_20_08.rst  |  6 ++
>  drivers/mempool/ring/rte_mempool_ring.c | 88 ++++++++++++++++++++++---
>  3 files changed, 95 insertions(+), 9 deletions(-)
> 
> diff --git a/doc/guides/mempool/ring.rst b/doc/guides/mempool/ring.rst
> index b8659c03f..9e2824070 100644
> --- a/doc/guides/mempool/ring.rst
> +++ b/doc/guides/mempool/ring.rst
> @@ -29,6 +29,16 @@ and can be selected via mempool ops API:
>    Underlying **rte_ring** operates in multi-thread producer,
>    single-thread consumer sync mode.
>  
> +- ``ring_mt_rts``
> +
> +  For underlying **rte_ring** both producer and consumer operate in
> +  multi-thread Relaxed Tail Sync (RTS) mode.
> +
> +- ``ring_mt_hts``
> +
> +  For underlying **rte_ring** both producer and consumer operate in
> +  multi-thread Haad-Tail Sync (HTS) mode.

Typo Haad -> Head

Please explain what these modes mean and why/when use them.