Hi, > My question is :rte_mempool_mp_put_bulk() and > rte_mempool_sp_put_bulk() call the same function __mempool_put_bulk() > with different "is_mp" value. If is_mp=1, that is ,multi-producer, the > code will add these objects in cache while there is enough room, when > two thread enqueue objects at the same time, isn't it unsafe?but the > annotation show this function is "multi-producer safe".
This is not the only difference: rte_mempool_mp_put() will call rte_ring_mp_enqueue() to add the objects from cache to the common pool. This function uses a compare_and_set() to update the head/tail indexes. And rte_mempool_sp_put() uses rte_ring_mp_enqueue() which is simpler but not thread safe. > Another question: how many thread we can have on a core? just one? Yes. Both mempool and ring are designed to run with one pthread per lcore: mempool uses a per-lcore cache, and the ring_mp/mc functions assume that a pthread is not interrupted by another pthread. Regards, Olivier
