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dev@dpdk.org; Wang, Yipeng1 >> ; Gobriel, Sameh ; >> Richardson, Bruce ; Medvedkin, Vladimir >> >> Subject: Re: [dpdk-dev] Doubt regarding DPDK hash Library >> implementation >> >> +Cc hash lib maintainers >> >> 01/11/2021 11:55, Syam Prasad N Pearson: >>> Dear Sir/Madam, >>> I am a developer trying to get familiar with the DPDK hash library. >> I >>> tried to make and use a hash table successfully. >>> During the development I came across a variable >>> >>> /** 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. >>> I am using DPDK 20.11.3 LTS. >>> >>> Please help. >> >> > -- Regards, Vladimir