[dpdk-dev] [PATCH v2] ring: use aligned memzone allocation

[Yerden Zhumabekov]

On 06.06.2017 19:19, Ananyev, Konstantin wrote:
>
>>>> Maybe there is some deeper  reason for the >= 128-byte alignment logic in rte_ring.h?
>>> Might be, would be good to hear opinion the author of that change.
>> It gives improved performance for core-2-core transfer.
> You mean empty cache-line(s) after prod/cons, correct?
> That's ok but why we can't keep them and whole rte_ring aligned on cache-line boundaries?
> Something like that:
> struct rte_ring {
>     ...
>     struct rte_ring_headtail prod __rte_cache_aligned;
>     EMPTY_CACHE_LINE   __rte_cache_aligned;
>     struct rte_ring_headtail cons __rte_cache_aligned;
>     EMPTY_CACHE_LINE   __rte_cache_aligned;
> };
>
> Konstantin
>

I'm curious, can anyone explain, how does it actually affect 
performance? Maybe we can utilize it application code?