X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Fhash%2Frte_cuckoo_hash.h;h=eb2644f74b1b6525652b25f7114116ababdec3e7;hb=6de0ea50e9b9d0129079689be1e335d1ffbf17d3;hp=85be49d3bbe7a1b1c57dfc79548d61d39b53cbc7;hpb=99a2dd955fba6e4cc23b77d590a033650ced9c45;p=dpdk.git

diff --git a/lib/hash/rte_cuckoo_hash.h b/lib/hash/rte_cuckoo_hash.h
index 85be49d3bb..eb2644f74b 100644
--- a/lib/hash/rte_cuckoo_hash.h
+++ b/lib/hash/rte_cuckoo_hash.h
@@ -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)