test/hash: check lock-free extendable bucket
authorDharmik Thakkar <dharmik.thakkar@arm.com>
Tue, 2 Apr 2019 19:44:55 +0000 (19:44 +0000)
committerThomas Monjalon <thomas@monjalon.net>
Wed, 3 Apr 2019 18:55:02 +0000 (20:55 +0200)
Add unit test to check for hash lookup and bulk-lookup perf for
extendable bucket feature.
It is tested with both lock-free enabled and lock-free disabled case.

Test includes:

- hash lookup on keys in ext bkt
- hash delete causing key-shifts of keys from ext bkt to secondary bkt

Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Signed-off-by: Dharmik Thakkar <dharmik.thakkar@arm.com>
Acked-by: Yipeng Wang <yipeng1.wang@intel.com>
app/test/test_hash_readwrite_lf.c

index cbfd932..4ab4c8e 100644 (file)
 #define READ_PASS_SHIFT_PATH 4
 #define READ_PASS_NON_SHIFT_PATH 8
 #define BULK_LOOKUP 16
+#define READ_PASS_KEY_SHIFTS_EXTBKT 32
+
+#define WRITE_NO_KEY_SHIFT 0
+#define WRITE_KEY_SHIFT 1
+#define WRITE_EXT_BKT 2
+
 #define NUM_TEST 3
 unsigned int rwc_core_cnt[NUM_TEST] = {1, 2, 4};
 
@@ -51,6 +57,7 @@ struct rwc_perf {
        uint32_t w_ks_r_hit_sp[2][NUM_TEST];
        uint32_t w_ks_r_miss[2][NUM_TEST];
        uint32_t multi_rw[NUM_TEST - 1][2][NUM_TEST];
+       uint32_t w_ks_r_hit_extbkt[2][NUM_TEST];
 };
 
 static struct rwc_perf rwc_lf_results, rwc_non_lf_results;
@@ -62,11 +69,15 @@ struct {
        uint32_t *keys_absent;
        uint32_t *keys_shift_path;
        uint32_t *keys_non_shift_path;
+       uint32_t *keys_ext_bkt;
+       uint32_t *keys_ks_extbkt;
        uint32_t count_keys_no_ks;
        uint32_t count_keys_ks;
        uint32_t count_keys_absent;
        uint32_t count_keys_shift_path;
        uint32_t count_keys_non_shift_path;
+       uint32_t count_keys_extbkt;
+       uint32_t count_keys_ks_extbkt;
        uint32_t single_insert;
        struct rte_hash *h;
 } tbl_rwc_test_param;
@@ -81,6 +92,35 @@ uint16_t enabled_core_ids[RTE_MAX_LCORE];
 
 uint8_t *scanned_bkts;
 
+static inline uint16_t
+get_short_sig(const hash_sig_t hash)
+{
+       return hash >> 16;
+}
+
+static inline uint32_t
+get_prim_bucket_index(__attribute__((unused)) const struct rte_hash *h,
+                     const hash_sig_t hash)
+{
+       uint32_t num_buckets;
+       uint32_t bucket_bitmask;
+       num_buckets  = rte_align32pow2(TOTAL_ENTRY) / 8;
+       bucket_bitmask = num_buckets - 1;
+       return hash & bucket_bitmask;
+}
+
+static inline uint32_t
+get_alt_bucket_index(__attribute__((unused)) const struct rte_hash *h,
+                       uint32_t cur_bkt_idx, uint16_t sig)
+{
+       uint32_t num_buckets;
+       uint32_t bucket_bitmask;
+       num_buckets  = rte_align32pow2(TOTAL_ENTRY) / 8;
+       bucket_bitmask = num_buckets - 1;
+       return (cur_bkt_idx ^ sig) & bucket_bitmask;
+}
+
+
 static inline int
 get_enabled_cores_list(void)
 {
@@ -168,9 +208,12 @@ generate_keys(void)
        uint32_t *keys_ks = NULL;
        uint32_t *keys_absent = NULL;
        uint32_t *keys_non_shift_path = NULL;
+       uint32_t *keys_ext_bkt = NULL;
+       uint32_t *keys_ks_extbkt = NULL;
        uint32_t *found = NULL;
        uint32_t count_keys_no_ks = 0;
        uint32_t count_keys_ks = 0;
+       uint32_t count_keys_extbkt = 0;
        uint32_t i;
 
        /*
@@ -251,14 +294,32 @@ generate_keys(void)
                goto err;
        }
 
+       /*
+        * This consist of keys which will be stored in extended buckets
+        */
+       keys_ext_bkt = rte_malloc(NULL, sizeof(uint32_t) * TOTAL_INSERT, 0);
+       if (keys_ext_bkt == NULL) {
+               printf("RTE_MALLOC failed\n");
+               goto err;
+       }
+
+       /*
+        * This consist of keys which when deleted causes shifting of keys
+        * in extended buckets to respective secondary buckets
+        */
+       keys_ks_extbkt = rte_malloc(NULL, sizeof(uint32_t) * TOTAL_INSERT, 0);
+       if (keys_ks_extbkt == NULL) {
+               printf("RTE_MALLOC failed\n");
+               goto err;
+       }
 
        hash_sig_t sig;
        uint32_t prim_bucket_idx;
-       int ret;
+       uint32_t sec_bucket_idx;
+       uint16_t short_sig;
        uint32_t num_buckets;
-       uint32_t bucket_bitmask;
        num_buckets  = rte_align32pow2(TOTAL_ENTRY) / 8;
-       bucket_bitmask = num_buckets - 1;
+       int ret;
 
        /*
         * Used to mark bkts in which at least one key was shifted to its
@@ -275,6 +336,8 @@ generate_keys(void)
        tbl_rwc_test_param.keys_ks = keys_ks;
        tbl_rwc_test_param.keys_absent = keys_absent;
        tbl_rwc_test_param.keys_non_shift_path = keys_non_shift_path;
+       tbl_rwc_test_param.keys_ext_bkt = keys_ext_bkt;
+       tbl_rwc_test_param.keys_ks_extbkt = keys_ks_extbkt;
        /* Generate keys by adding previous two keys, neglect overflow */
        printf("Generating keys...\n");
        keys[0] = 0;
@@ -287,7 +350,8 @@ generate_keys(void)
                /* Check if primary bucket has space.*/
                sig = rte_hash_hash(tbl_rwc_test_param.h,
                                        tbl_rwc_test_param.keys+i);
-               prim_bucket_idx = sig & bucket_bitmask;
+               prim_bucket_idx = get_prim_bucket_index(tbl_rwc_test_param.h,
+                                                       sig);
                ret = check_bucket(prim_bucket_idx, keys[i]);
                if (ret < 0) {
                        /*
@@ -368,6 +432,47 @@ generate_keys(void)
        tbl_rwc_test_param.count_keys_absent = count_keys_absent;
        tbl_rwc_test_param.count_keys_non_shift_path = count;
 
+       memset(scanned_bkts, 0, num_buckets);
+       count = 0;
+       /* Find keys that will be in extended buckets */
+       for (i = 0; i < count_keys_ks; i++) {
+               ret = rte_hash_add_key(tbl_rwc_test_param.h, keys_ks + i);
+               if (ret < 0) {
+                       /* Key will be added to ext bkt */
+                       keys_ext_bkt[count_keys_extbkt++] = keys_ks[i];
+                       /* Sec bkt to be added to keys_ks_extbkt */
+                       sig = rte_hash_hash(tbl_rwc_test_param.h,
+                                       tbl_rwc_test_param.keys_ks + i);
+                       prim_bucket_idx = get_prim_bucket_index(
+                                               tbl_rwc_test_param.h, sig);
+                       short_sig = get_short_sig(sig);
+                       sec_bucket_idx = get_alt_bucket_index(
+                                               tbl_rwc_test_param.h,
+                                               prim_bucket_idx, short_sig);
+                       if (scanned_bkts[sec_bucket_idx] == 0)
+                               scanned_bkts[sec_bucket_idx] = 1;
+               }
+       }
+
+       /* Find keys that will shift keys in ext bucket*/
+       for (i = 0; i < num_buckets; i++) {
+               if (scanned_bkts[i] == 1) {
+                       iter = i * 8;
+                       while (rte_hash_iterate(tbl_rwc_test_param.h,
+                               &next_key, &next_data, &iter) >= 0) {
+                               /* Check if key belongs to the current bucket */
+                               if (i >= (iter-1)/8)
+                                       keys_ks_extbkt[count++]
+                                               = *(const uint32_t *)next_key;
+                               else
+                                       break;
+                       }
+               }
+       }
+
+       tbl_rwc_test_param.count_keys_ks_extbkt = count;
+       tbl_rwc_test_param.count_keys_extbkt = count_keys_extbkt;
+
        printf("\nCount of keys NOT causing shifting of existing keys to "
        "alternate location: %d\n", tbl_rwc_test_param.count_keys_no_ks);
        printf("\nCount of keys causing shifting of existing keys to alternate "
@@ -378,6 +483,10 @@ generate_keys(void)
               tbl_rwc_test_param.count_keys_shift_path);
        printf("Count of keys not likely to be on the shift path: %d\n\n",
               tbl_rwc_test_param.count_keys_non_shift_path);
+       printf("Count of keys in extended buckets: %d\n\n",
+              tbl_rwc_test_param.count_keys_extbkt);
+       printf("Count of keys shifting keys in ext buckets: %d\n\n",
+              tbl_rwc_test_param.count_keys_ks_extbkt);
 
        rte_free(found);
        rte_hash_free(tbl_rwc_test_param.h);
@@ -390,12 +499,14 @@ err:
        rte_free(keys_absent);
        rte_free(found);
        rte_free(tbl_rwc_test_param.keys_shift_path);
+       rte_free(keys_ext_bkt);
+       rte_free(keys_ks_extbkt);
        rte_free(scanned_bkts);
        return -1;
 }
 
 static int
-init_params(int rwc_lf, int use_jhash, int htm)
+init_params(int rwc_lf, int use_jhash, int htm, int ext_bkt)
 {
        struct rte_hash *handle;
 
@@ -425,6 +536,9 @@ init_params(int rwc_lf, int use_jhash, int htm)
                        RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY |
                        RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD;
 
+       if (ext_bkt)
+               hash_params.extra_flag |= RTE_HASH_EXTRA_FLAGS_EXT_TABLE;
+
        hash_params.name = "tests";
 
        handle = rte_hash_create(&hash_params);
@@ -452,7 +566,7 @@ test_rwc_reader(__attribute__((unused)) void *arg)
        void *temp_a[BULK_LOOKUP_SIZE];
 
        /* Used to identify keys not inserted in the hash table */
-       pos = rte_zmalloc(NULL, sizeof(uint32_t) * BULK_LOOKUP_SIZE, 0);
+       pos = rte_malloc(NULL, sizeof(uint32_t) * BULK_LOOKUP_SIZE, 0);
        if (pos == NULL) {
                printf("RTE_MALLOC failed\n");
                return -1;
@@ -467,6 +581,9 @@ test_rwc_reader(__attribute__((unused)) void *arg)
        } else if (read_type & READ_PASS_SHIFT_PATH) {
                keys = tbl_rwc_test_param.keys_shift_path;
                read_cnt = tbl_rwc_test_param.count_keys_shift_path;
+       } else if (read_type & READ_PASS_KEY_SHIFTS_EXTBKT) {
+               keys = tbl_rwc_test_param.keys_ext_bkt;
+               read_cnt = tbl_rwc_test_param.count_keys_extbkt;
        } else {
                keys = tbl_rwc_test_param.keys_non_shift_path;
                read_cnt = tbl_rwc_test_param.count_keys_non_shift_path;
@@ -482,7 +599,6 @@ test_rwc_reader(__attribute__((unused)) void *arg)
                                /* Array of  pointer to the list of keys */
                                for (j = 0; j < BULK_LOOKUP_SIZE; j++)
                                        temp_a[j] = keys + i + j;
-
                                rte_hash_lookup_bulk(tbl_rwc_test_param.h,
                                                   (const void **)
                                                   ((uintptr_t)temp_a),
@@ -539,22 +655,25 @@ test_rwc_reader(__attribute__((unused)) void *arg)
 }
 
 static int
-write_keys(uint8_t key_shift)
+write_keys(uint8_t write_type)
 {
        uint32_t i;
        int ret;
-       uint32_t key_cnt;
+       uint32_t key_cnt = 0;
        uint32_t *keys;
-       if (key_shift) {
+       if (write_type == WRITE_KEY_SHIFT) {
                key_cnt = tbl_rwc_test_param.count_keys_ks;
                keys = tbl_rwc_test_param.keys_ks;
-       } else {
+       } else if (write_type == WRITE_NO_KEY_SHIFT) {
                key_cnt = tbl_rwc_test_param.count_keys_no_ks;
                keys = tbl_rwc_test_param.keys_no_ks;
+       } else if (write_type == WRITE_EXT_BKT) {
+               key_cnt = tbl_rwc_test_param.count_keys_extbkt;
+               keys = tbl_rwc_test_param.keys_ext_bkt;
        }
        for (i = 0; i < key_cnt; i++) {
                ret = rte_hash_add_key(tbl_rwc_test_param.h, keys + i);
-               if (!key_shift && ret < 0) {
+               if ((write_type == WRITE_NO_KEY_SHIFT) && ret < 0) {
                        printf("writer failed %"PRIu32"\n", i);
                        return -1;
                }
@@ -581,18 +700,18 @@ test_rwc_multi_writer(__attribute__((unused)) void *arg)
  */
 static int
 test_hash_add_no_ks_lookup_hit(struct rwc_perf *rwc_perf_results, int rwc_lf,
-                               int htm)
+                               int htm, int ext_bkt)
 {
        unsigned int n, m;
        uint64_t i;
        int use_jhash = 0;
-       uint8_t key_shift = 0;
+       uint8_t write_type = WRITE_NO_KEY_SHIFT;
        uint8_t read_type = READ_PASS_NO_KEY_SHIFTS;
 
        rte_atomic64_init(&greads);
        rte_atomic64_init(&gread_cycles);
 
-       if (init_params(rwc_lf, use_jhash, htm) != 0)
+       if (init_params(rwc_lf, use_jhash, htm, ext_bkt) != 0)
                goto err;
        printf("\nTest: Hash add - no key-shifts, read - hit\n");
        for (m = 0; m < 2; m++) {
@@ -612,7 +731,7 @@ test_hash_add_no_ks_lookup_hit(struct rwc_perf *rwc_perf_results, int rwc_lf,
 
                        rte_hash_reset(tbl_rwc_test_param.h);
                        writer_done = 0;
-                       if (write_keys(key_shift) < 0)
+                       if (write_keys(write_type) < 0)
                                goto err;
                        writer_done = 1;
                        for (i = 1; i <= rwc_core_cnt[n]; i++)
@@ -650,19 +769,19 @@ err:
  */
 static int
 test_hash_add_no_ks_lookup_miss(struct rwc_perf *rwc_perf_results, int rwc_lf,
-                               int htm)
+                               int htm, int ext_bkt)
 {
        unsigned int n, m;
        uint64_t i;
        int use_jhash = 0;
-       uint8_t key_shift = 0;
+       uint8_t write_type = WRITE_NO_KEY_SHIFT;
        uint8_t read_type = READ_FAIL;
        int ret;
 
        rte_atomic64_init(&greads);
        rte_atomic64_init(&gread_cycles);
 
-       if (init_params(rwc_lf, use_jhash, htm) != 0)
+       if (init_params(rwc_lf, use_jhash, htm, ext_bkt) != 0)
                goto err;
        printf("\nTest: Hash add - no key-shifts, Hash lookup - miss\n");
        for (m = 0; m < 2; m++) {
@@ -687,7 +806,7 @@ test_hash_add_no_ks_lookup_miss(struct rwc_perf *rwc_perf_results, int rwc_lf,
                                rte_eal_remote_launch(test_rwc_reader,
                                                (void *)(uintptr_t)read_type,
                                                        enabled_core_ids[i]);
-                       ret = write_keys(key_shift);
+                       ret = write_keys(write_type);
                        writer_done = 1;
                        rte_eal_mp_wait_lcore();
 
@@ -722,19 +841,19 @@ err:
  */
 static int
 test_hash_add_ks_lookup_hit_non_sp(struct rwc_perf *rwc_perf_results,
-                                   int rwc_lf, int htm)
+                                   int rwc_lf, int htm, int ext_bkt)
 {
        unsigned int n, m;
        uint64_t i;
        int use_jhash = 0;
        int ret;
-       uint8_t key_shift;
+       uint8_t write_type;
        uint8_t read_type = READ_PASS_NON_SHIFT_PATH;
 
        rte_atomic64_init(&greads);
        rte_atomic64_init(&gread_cycles);
 
-       if (init_params(rwc_lf, use_jhash, htm) != 0)
+       if (init_params(rwc_lf, use_jhash, htm, ext_bkt) != 0)
                goto err;
        printf("\nTest: Hash add - key shift, Hash lookup - hit"
               " (non-shift-path)\n");
@@ -755,15 +874,15 @@ test_hash_add_ks_lookup_hit_non_sp(struct rwc_perf *rwc_perf_results,
 
                        rte_hash_reset(tbl_rwc_test_param.h);
                        writer_done = 0;
-                       key_shift = 0;
-                       if (write_keys(key_shift) < 0)
+                       write_type = WRITE_NO_KEY_SHIFT;
+                       if (write_keys(write_type) < 0)
                                goto err;
                        for (i = 1; i <= rwc_core_cnt[n]; i++)
                                rte_eal_remote_launch(test_rwc_reader,
                                                (void *)(uintptr_t)read_type,
                                                        enabled_core_ids[i]);
-                       key_shift = 1;
-                       ret = write_keys(key_shift);
+                       write_type = WRITE_KEY_SHIFT;
+                       ret = write_keys(write_type);
                        writer_done = 1;
                        rte_eal_mp_wait_lcore();
 
@@ -798,19 +917,19 @@ err:
  */
 static int
 test_hash_add_ks_lookup_hit_sp(struct rwc_perf *rwc_perf_results, int rwc_lf,
-                               int htm)
+                               int htm, int ext_bkt)
 {
        unsigned int n, m;
        uint64_t i;
        int use_jhash = 0;
        int ret;
-       uint8_t key_shift;
+       uint8_t write_type;
        uint8_t read_type = READ_PASS_SHIFT_PATH;
 
        rte_atomic64_init(&greads);
        rte_atomic64_init(&gread_cycles);
 
-       if (init_params(rwc_lf, use_jhash, htm) != 0)
+       if (init_params(rwc_lf, use_jhash, htm, ext_bkt) != 0)
                goto err;
        printf("\nTest: Hash add - key shift, Hash lookup - hit (shift-path)"
               "\n");
@@ -831,15 +950,15 @@ test_hash_add_ks_lookup_hit_sp(struct rwc_perf *rwc_perf_results, int rwc_lf,
 
                        rte_hash_reset(tbl_rwc_test_param.h);
                        writer_done = 0;
-                       key_shift = 0;
-                       if (write_keys(key_shift) < 0)
+                       write_type = WRITE_NO_KEY_SHIFT;
+                       if (write_keys(write_type) < 0)
                                goto err;
                        for (i = 1; i <= rwc_core_cnt[n]; i++)
                                rte_eal_remote_launch(test_rwc_reader,
                                                (void *)(uintptr_t)read_type,
                                                enabled_core_ids[i]);
-                       key_shift = 1;
-                       ret = write_keys(key_shift);
+                       write_type = WRITE_KEY_SHIFT;
+                       ret = write_keys(write_type);
                        writer_done = 1;
                        rte_eal_mp_wait_lcore();
 
@@ -874,19 +993,19 @@ err:
  */
 static int
 test_hash_add_ks_lookup_miss(struct rwc_perf *rwc_perf_results, int rwc_lf, int
-                            htm)
+                            htm, int ext_bkt)
 {
        unsigned int n, m;
        uint64_t i;
        int use_jhash = 0;
        int ret;
-       uint8_t key_shift;
+       uint8_t write_type;
        uint8_t read_type = READ_FAIL;
 
        rte_atomic64_init(&greads);
        rte_atomic64_init(&gread_cycles);
 
-       if (init_params(rwc_lf, use_jhash, htm) != 0)
+       if (init_params(rwc_lf, use_jhash, htm, ext_bkt) != 0)
                goto err;
        printf("\nTest: Hash add - key shift, Hash lookup - miss\n");
        for (m = 0; m < 2; m++) {
@@ -906,15 +1025,15 @@ test_hash_add_ks_lookup_miss(struct rwc_perf *rwc_perf_results, int rwc_lf, int
 
                        rte_hash_reset(tbl_rwc_test_param.h);
                        writer_done = 0;
-                       key_shift = 0;
-                       if (write_keys(key_shift) < 0)
+                       write_type = WRITE_NO_KEY_SHIFT;
+                       if (write_keys(write_type) < 0)
                                goto err;
                        for (i = 1; i <= rwc_core_cnt[n]; i++)
                                rte_eal_remote_launch(test_rwc_reader,
                                                (void *)(uintptr_t)read_type,
                                                        enabled_core_ids[i]);
-                       key_shift = 1;
-                       ret = write_keys(key_shift);
+                       write_type = WRITE_KEY_SHIFT;
+                       ret = write_keys(write_type);
                        writer_done = 1;
                        rte_eal_mp_wait_lcore();
 
@@ -949,18 +1068,18 @@ err:
  */
 static int
 test_hash_multi_add_lookup(struct rwc_perf *rwc_perf_results, int rwc_lf,
-                          int htm)
+                          int htm, int ext_bkt)
 {
        unsigned int n, m, k;
        uint64_t i;
        int use_jhash = 0;
-       uint8_t key_shift;
+       uint8_t write_type;
        uint8_t read_type = READ_PASS_SHIFT_PATH;
 
        rte_atomic64_init(&greads);
        rte_atomic64_init(&gread_cycles);
 
-       if (init_params(rwc_lf, use_jhash, htm) != 0)
+       if (init_params(rwc_lf, use_jhash, htm, ext_bkt) != 0)
                goto err;
        printf("\nTest: Multi-add-lookup\n");
        uint8_t pos_core;
@@ -991,8 +1110,8 @@ test_hash_multi_add_lookup(struct rwc_perf *rwc_perf_results, int rwc_lf,
                                writer_done = 0;
                                for (i = 0; i < 4; i++)
                                        multi_writer_done[i] = 0;
-                               key_shift = 0;
-                               if (write_keys(key_shift) < 0)
+                               write_type = WRITE_NO_KEY_SHIFT;
+                               if (write_keys(write_type) < 0)
                                        goto err;
 
                                /* Launch reader(s) */
@@ -1000,7 +1119,7 @@ test_hash_multi_add_lookup(struct rwc_perf *rwc_perf_results, int rwc_lf,
                                        rte_eal_remote_launch(test_rwc_reader,
                                                (void *)(uintptr_t)read_type,
                                                enabled_core_ids[i]);
-                               key_shift = 1;
+                               write_type = WRITE_KEY_SHIFT;
                                pos_core = 0;
 
                                /* Launch writers */
@@ -1045,6 +1164,88 @@ err:
        return -1;
 }
 
+/*
+ * Test lookup perf:
+ * Reader(s) lookup keys present in the extendable bkt.
+ */
+static int
+test_hash_add_ks_lookup_hit_extbkt(struct rwc_perf *rwc_perf_results,
+                               int rwc_lf, int htm, int ext_bkt)
+{
+       unsigned int n, m;
+       uint64_t i;
+       int use_jhash = 0;
+       uint8_t write_type;
+       uint8_t read_type = READ_PASS_KEY_SHIFTS_EXTBKT;
+
+       rte_atomic64_init(&greads);
+       rte_atomic64_init(&gread_cycles);
+
+       if (init_params(rwc_lf, use_jhash, htm, ext_bkt) != 0)
+               goto err;
+       printf("\nTest: Hash add - key-shifts, read - hit (ext_bkt)\n");
+       for (m = 0; m < 2; m++) {
+               if (m == 1) {
+                       printf("\n** With bulk-lookup **\n");
+                       read_type |= BULK_LOOKUP;
+               }
+               for (n = 0; n < NUM_TEST; n++) {
+                       unsigned int tot_lcore = rte_lcore_count();
+                       if (tot_lcore < rwc_core_cnt[n] + 1)
+                               goto finish;
+
+                       printf("\nNumber of readers: %u\n", rwc_core_cnt[n]);
+
+                       rte_atomic64_clear(&greads);
+                       rte_atomic64_clear(&gread_cycles);
+
+                       rte_hash_reset(tbl_rwc_test_param.h);
+                       write_type = WRITE_NO_KEY_SHIFT;
+                       if (write_keys(write_type) < 0)
+                               goto err;
+                       write_type = WRITE_KEY_SHIFT;
+                       if (write_keys(write_type) < 0)
+                               goto err;
+                       writer_done = 0;
+                       for (i = 1; i <= rwc_core_cnt[n]; i++)
+                               rte_eal_remote_launch(test_rwc_reader,
+                                               (void *)(uintptr_t)read_type,
+                                                       enabled_core_ids[i]);
+                       for (i = 0; i < tbl_rwc_test_param.count_keys_ks_extbkt;
+                            i++) {
+                               if (rte_hash_del_key(tbl_rwc_test_param.h,
+                                       tbl_rwc_test_param.keys_ks_extbkt + i)
+                                                       < 0) {
+                                       printf("Delete Failed: %u\n",
+                                       tbl_rwc_test_param.keys_ks_extbkt[i]);
+                                       goto err;
+                               }
+                       }
+                       writer_done = 1;
+                       rte_eal_mp_wait_lcore();
+
+                       for (i = 1; i <= rwc_core_cnt[n]; i++)
+                               if (lcore_config[i].ret < 0)
+                                       goto err;
+
+                       unsigned long long cycles_per_lookup =
+                               rte_atomic64_read(&gread_cycles) /
+                               rte_atomic64_read(&greads);
+                       rwc_perf_results->w_ks_r_hit_extbkt[m][n]
+                                               = cycles_per_lookup;
+                       printf("Cycles per lookup: %llu\n", cycles_per_lookup);
+               }
+       }
+
+finish:
+       rte_hash_free(tbl_rwc_test_param.h);
+       return 0;
+
+err:
+       rte_hash_free(tbl_rwc_test_param.h);
+       return -1;
+}
+
 static int
 test_hash_readwrite_lf_main(void)
 {
@@ -1057,6 +1258,7 @@ test_hash_readwrite_lf_main(void)
        int rwc_lf = 0;
        int htm;
        int use_jhash = 0;
+       int ext_bkt = 0;
        if (rte_lcore_count() == 1) {
                printf("More than one lcore is required "
                        "to do read write lock-free concurrency test\n");
@@ -1070,7 +1272,7 @@ test_hash_readwrite_lf_main(void)
        else
                htm = 0;
 
-       if (init_params(rwc_lf, use_jhash, htm) != 0)
+       if (init_params(rwc_lf, use_jhash, htm, ext_bkt) != 0)
                return -1;
        if (generate_keys() != 0)
                return -1;
@@ -1079,25 +1281,29 @@ test_hash_readwrite_lf_main(void)
 
        if (RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF) {
                rwc_lf = 1;
+               ext_bkt = 1;
                printf("Test lookup with read-write concurrency lock free support"
                       " enabled\n");
                if (test_hash_add_no_ks_lookup_hit(&rwc_lf_results, rwc_lf,
-                                                       htm) < 0)
+                                                       htm, ext_bkt) < 0)
                        return -1;
                if (test_hash_add_no_ks_lookup_miss(&rwc_lf_results, rwc_lf,
-                                                       htm) < 0)
+                                                       htm, ext_bkt) < 0)
                        return -1;
                if (test_hash_add_ks_lookup_hit_non_sp(&rwc_lf_results, rwc_lf,
-                                                       htm) < 0)
+                                                       htm, ext_bkt) < 0)
                        return -1;
                if (test_hash_add_ks_lookup_hit_sp(&rwc_lf_results, rwc_lf,
-                                                       htm) < 0)
+                                                       htm, ext_bkt) < 0)
                        return -1;
-               if (test_hash_add_ks_lookup_miss(&rwc_lf_results, rwc_lf, htm)
-                                                       < 0)
+               if (test_hash_add_ks_lookup_miss(&rwc_lf_results, rwc_lf, htm,
+                                                ext_bkt) < 0)
                        return -1;
-               if (test_hash_multi_add_lookup(&rwc_lf_results, rwc_lf, htm)
-                                                       < 0)
+               if (test_hash_multi_add_lookup(&rwc_lf_results, rwc_lf, htm,
+                                              ext_bkt) < 0)
+                       return -1;
+               if (test_hash_add_ks_lookup_hit_extbkt(&rwc_lf_results, rwc_lf,
+                                                       htm, ext_bkt) < 0)
                        return -1;
        }
        printf("\nTest lookup with read-write concurrency lock free support"
@@ -1112,21 +1318,26 @@ test_hash_readwrite_lf_main(void)
                }
        } else
                printf("With HTM Enabled\n");
-       if (test_hash_add_no_ks_lookup_hit(&rwc_non_lf_results, rwc_lf, htm)
-                                               < 0)
+       if (test_hash_add_no_ks_lookup_hit(&rwc_non_lf_results, rwc_lf, htm,
+                                          ext_bkt) < 0)
                return -1;
-       if (test_hash_add_no_ks_lookup_miss(&rwc_non_lf_results, rwc_lf, htm)
-                                               < 0)
+       if (test_hash_add_no_ks_lookup_miss(&rwc_non_lf_results, rwc_lf, htm,
+                                               ext_bkt) < 0)
                return -1;
        if (test_hash_add_ks_lookup_hit_non_sp(&rwc_non_lf_results, rwc_lf,
-                                               htm) < 0)
+                                               htm, ext_bkt) < 0)
+               return -1;
+       if (test_hash_add_ks_lookup_hit_sp(&rwc_non_lf_results, rwc_lf, htm,
+                                               ext_bkt) < 0)
                return -1;
-       if (test_hash_add_ks_lookup_hit_sp(&rwc_non_lf_results, rwc_lf, htm)
-                                               < 0)
+       if (test_hash_add_ks_lookup_miss(&rwc_non_lf_results, rwc_lf, htm,
+                                        ext_bkt) < 0)
                return -1;
-       if (test_hash_add_ks_lookup_miss(&rwc_non_lf_results, rwc_lf, htm) < 0)
+       if (test_hash_multi_add_lookup(&rwc_non_lf_results, rwc_lf, htm,
+                                                       ext_bkt) < 0)
                return -1;
-       if (test_hash_multi_add_lookup(&rwc_non_lf_results, rwc_lf, htm) < 0)
+       if (test_hash_add_ks_lookup_hit_extbkt(&rwc_non_lf_results, rwc_lf,
+                                               htm, ext_bkt) < 0)
                return -1;
 results:
        printf("\n\t\t\t\t\t\t********** Results summary **********\n\n");
@@ -1158,8 +1369,11 @@ results:
                               "(shift-path)\t\t%u\n\t\t\t\t\t\t\t\t",
                               rwc_lf_results.w_ks_r_hit_sp[j][i]);
                        printf("Hash add - key-shifts, Hash lookup miss\t\t\t\t"
-                               "%u\n\n\t\t\t\t",
+                               "%u\n\t\t\t\t\t\t\t\t",
                                rwc_lf_results.w_ks_r_miss[j][i]);
+                       printf("Hash add - key-shifts, Hash lookup hit (ext_bkt)\t\t"
+                               "%u\n\n\t\t\t\t",
+                               rwc_lf_results.w_ks_r_hit_extbkt[j][i]);
 
                        printf("Disabled\t");
                        if (htm)
@@ -1179,7 +1393,11 @@ results:
                               "(shift-path)\t\t%u\n\t\t\t\t\t\t\t\t",
                               rwc_non_lf_results.w_ks_r_hit_sp[j][i]);
                        printf("Hash add - key-shifts, Hash lookup miss\t\t\t\t"
-                              "%u\n", rwc_non_lf_results.w_ks_r_miss[j][i]);
+                              "%u\n\t\t\t\t\t\t\t\t",
+                              rwc_non_lf_results.w_ks_r_miss[j][i]);
+                       printf("Hash add - key-shifts, Hash lookup hit (ext_bkt)\t\t"
+                               "%u\n",
+                               rwc_non_lf_results.w_ks_r_hit_extbkt[j][i]);
 
                        printf("_______\t\t_______\t\t_________\t___\t\t"
                               "_________\t\t\t\t\t\t_________________\n");