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

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

> 
> 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

Will fix.

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

We have quite detailed explanation in ring library guide:
https://doc.dpdk.org/guides/prog_guide/ring_lib.html
7.6. Producer/consumer synchronization modes
So here, I put a link to ring library guide for those who need more details.
I can copy&paste same text here too,
but it probably not much point in such duplication.