[dpdk-dev] [PATCH v3 3/8] hash: fix to have more accurate key slot size
Yipeng Wang
yipeng1.wang at intel.com
Fri Jul 6 21:46:41 CEST 2018
This commit calculates the needed key slot size more
accurately. The previous local cache fix requires
the free slot ring to be larger than actually needed.
The calculation of the value is inaccurate.
Fixes: 5915699153d7 ("hash: fix scaling by reducing contention")
Cc: stable at dpdk.org
Signed-off-by: Yipeng Wang <yipeng1.wang at intel.com>
---
lib/librte_hash/rte_cuckoo_hash.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c
index 80dcf41..11602af 100644
--- a/lib/librte_hash/rte_cuckoo_hash.c
+++ b/lib/librte_hash/rte_cuckoo_hash.c
@@ -126,13 +126,13 @@ rte_hash_create(const struct rte_hash_parameters *params)
* except for the first cache
*/
num_key_slots = params->entries + (RTE_MAX_LCORE - 1) *
- LCORE_CACHE_SIZE + 1;
+ (LCORE_CACHE_SIZE - 1) + 1;
else
num_key_slots = params->entries + 1;
snprintf(ring_name, sizeof(ring_name), "HT_%s", params->name);
/* Create ring (Dummy slot index is not enqueued) */
- r = rte_ring_create(ring_name, rte_align32pow2(num_key_slots - 1),
+ r = rte_ring_create(ring_name, rte_align32pow2(num_key_slots),
params->socket_id, 0);
if (r == NULL) {
RTE_LOG(ERR, HASH, "memory allocation failed\n");
@@ -291,7 +291,7 @@ rte_hash_create(const struct rte_hash_parameters *params)
h->add_key = ADD_KEY_SINGLEWRITER;
/* Populate free slots ring. Entry zero is reserved for key misses. */
- for (i = 1; i < params->entries + 1; i++)
+ for (i = 1; i < num_key_slots; i++)
rte_ring_sp_enqueue(r, (void *)((uintptr_t) i));
te->data = (void *) h;
@@ -373,7 +373,7 @@ void
rte_hash_reset(struct rte_hash *h)
{
void *ptr;
- unsigned i;
+ uint32_t tot_ring_cnt, i;
if (h == NULL)
return;
@@ -386,7 +386,13 @@ rte_hash_reset(struct rte_hash *h)
rte_pause();
/* Repopulate the free slots ring. Entry zero is reserved for key misses */
- for (i = 1; i < h->entries + 1; i++)
+ if (h->hw_trans_mem_support)
+ tot_ring_cnt = h->entries + (RTE_MAX_LCORE - 1) *
+ (LCORE_CACHE_SIZE - 1);
+ else
+ tot_ring_cnt = h->entries;
+
+ for (i = 1; i < tot_ring_cnt + 1; i++)
rte_ring_sp_enqueue(h->free_slots, (void *)((uintptr_t) i));
if (h->hw_trans_mem_support) {
--
2.7.4
More information about the dev
mailing list