[dpdk-dev] [PATCH v2 0/2] Use WFE for spinlock and ring

[Honnappa Nagarahalli]

<snip>

> Subject: Re: [PATCH v2 0/2] Use WFE for spinlock and ring
> 
> On Sun, Apr 26, 2020 at 10:39 AM Gavin Hu <gavin.hu at arm.com> wrote:
> >
> > The rte_wait_until_equal_xxx APIs abstract the functionality of
> > 'polling for a memory location to become equal to a given value'[1].
> >
> > Use the API for the rte spinlock and ring implementations.
> >
> > [1] http://patches.dpdk.org/cover/62703/
> >
> > Gavin Hu (2):
> >   spinlock: use wfe to reduce contention on aarch64
> >   ring: use wfe to wait for ring tail update on aarch64
> 
> This would result in rte_ring and rte_spinlock APIs becoming experimental
> and this breaks compilation for external applications using stable ring and
> spinlock APIs.
> IIRC, it was the reason why these patches were dropped with the introduction
> of the rte_wait_until_equal_* API.
Agreed, the rte_ring new sync modes are resulting in different use cases for these APIs. We need to take a relook at the APIs.

> 
> 
> --
> David Marchand