04/11/2021 17:39, Medvedkin, Vladimir:
> >> 01/11/2021 11:55, Syam Prasad N Pearson:
> >>> /** Number of items per bucket. */
> >>> *#define RTE_HASH_BUCKET_ENTRIES 8*
> >>>
> >>> defined inside:
> >>> dpdk-20.11.3/dpdk-stable-20.11.3/lib/librte_hash /rte_cuckoo_hash.h
> >>>
> >>> Why does the library take this value as *8*, is there any particular
> >>> reason for this? what if it is 16,32... etc.
>
> Yes, RTE_HASH_BUCKET_ENTRIES can be any power of 2.
> The reason for choosing 8 is a tradeoff between performance and memory.
> When it is equal to 8, the sizeof(struct rte_hash_bucket) equal to
> RTE_CACHE_LINE_SIZE, thus, there are no gaps in memory between the hash
> buckets due to their alignment.

That's a good comment to add in the code.