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hash: clarify comment for bucket entries number

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This patch adds a comment for RTE_HASH_BUCKET_ENTRIES
explaining why a particular value was chosen.

Signed-off-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
This commit is contained in:
Vladimir Medvedkin 2021-11-10 18:36:14 +00:00 committed by Thomas Monjalon
parent f64b299cb3
commit 9da077adb3
1 changed files with 7 additions and 1 deletions
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8
lib/hash/rte_cuckoo_hash.h
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@ -101,7 +101,13 @@ const rte_hash_cmp_eq_t cmp_jump_table[NUM_KEY_CMP_CASES] = {
#endif
/** Number of items per bucket. */
/**
* Number of items per bucket.
* 8 is a tradeoff between performance and memory consumption.
* When it is equal to 8, multiple 'struct rte_hash_bucket' can be fit
* on a single cache line (64 or 128 bytes long) without any gaps
* in memory between them due to alignment.
*/
#define RTE_HASH_BUCKET_ENTRIES 8
#if !RTE_IS_POWER_OF_2(RTE_HASH_BUCKET_ENTRIES)