1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2017 Intel Corporation
9 #include <rte_mempool.h>
10 #include <rte_cycles.h>
11 #include <rte_common.h>
13 #include <rte_distributor.h>
14 #include <rte_pause.h>
16 #define ITER_POWER_CL 25 /* log 2 of how many iterations for Cache Line test */
17 #define ITER_POWER 21 /* log 2 of how many iterations we do when timing. */
19 #define BIG_BATCH 1024
21 /* static vars - zero initialized by default */
22 static volatile int quit;
23 static volatile unsigned worker_idx;
26 volatile unsigned handled_packets;
27 } __rte_cache_aligned;
28 struct worker_stats worker_stats[RTE_MAX_LCORE];
31 * worker thread used for testing the time to do a round-trip of a cache
32 * line between two cores and back again
35 flip_bit(volatile uint64_t *arg)
38 while (old_val != 2) {
47 * test case to time the number of cycles to round-trip a cache line between
48 * two cores and back again.
51 time_cache_line_switch(void)
53 /* allocate a full cache line for data, we use only first byte of it */
54 uint64_t data[RTE_CACHE_LINE_SIZE*3 / sizeof(uint64_t)];
56 unsigned i, slaveid = rte_get_next_lcore(rte_lcore_id(), 0, 0);
57 volatile uint64_t *pdata = &data[0];
59 rte_eal_remote_launch((lcore_function_t *)flip_bit, &data[0], slaveid);
63 const uint64_t start_time = rte_rdtsc();
64 for (i = 0; i < (1 << ITER_POWER_CL); i++) {
69 const uint64_t end_time = rte_rdtsc();
74 rte_eal_wait_lcore(slaveid);
75 printf("==== Cache line switch test ===\n");
76 printf("Time for %u iterations = %"PRIu64" ticks\n", (1<<ITER_POWER_CL),
78 printf("Ticks per iteration = %"PRIu64"\n\n",
79 (end_time-start_time) >> ITER_POWER_CL);
83 * returns the total count of the number of packets handled by the worker
84 * functions given below.
87 total_packet_count(void)
89 unsigned i, count = 0;
90 for (i = 0; i < worker_idx; i++)
91 count += worker_stats[i].handled_packets;
95 /* resets the packet counts for a new test */
97 clear_packet_count(void)
99 memset(&worker_stats, 0, sizeof(worker_stats));
103 * This is the basic worker function for performance tests.
104 * it does nothing but return packets and count them.
107 handle_work(void *arg)
109 struct rte_distributor *d = arg;
110 unsigned int count = 0;
111 unsigned int num = 0;
113 unsigned int id = __sync_fetch_and_add(&worker_idx, 1);
114 struct rte_mbuf *buf[8] __rte_cache_aligned;
116 for (i = 0; i < 8; i++)
119 num = rte_distributor_get_pkt(d, id, buf, buf, num);
121 worker_stats[id].handled_packets += num;
123 num = rte_distributor_get_pkt(d, id, buf, buf, num);
125 worker_stats[id].handled_packets += num;
127 rte_distributor_return_pkt(d, id, buf, num);
132 * This basic performance test just repeatedly sends in 32 packets at a time
133 * to the distributor and verifies at the end that we got them all in the worker
134 * threads and finally how long per packet the processing took.
137 perf_test(struct rte_distributor *d, struct rte_mempool *p)
141 struct rte_mbuf *bufs[BURST];
143 clear_packet_count();
144 if (rte_mempool_get_bulk(p, (void *)bufs, BURST) != 0) {
145 printf("Error getting mbufs from pool\n");
148 /* ensure we have different hash value for each pkt */
149 for (i = 0; i < BURST; i++)
150 bufs[i]->hash.usr = i;
153 for (i = 0; i < (1<<ITER_POWER); i++)
154 rte_distributor_process(d, bufs, BURST);
159 rte_distributor_process(d, NULL, 0);
160 } while (total_packet_count() < (BURST << ITER_POWER));
162 rte_distributor_clear_returns(d);
164 printf("Time per burst: %"PRIu64"\n", (end - start) >> ITER_POWER);
165 printf("Time per packet: %"PRIu64"\n\n",
166 ((end - start) >> ITER_POWER)/BURST);
167 rte_mempool_put_bulk(p, (void *)bufs, BURST);
169 for (i = 0; i < rte_lcore_count() - 1; i++)
170 printf("Worker %u handled %u packets\n", i,
171 worker_stats[i].handled_packets);
172 printf("Total packets: %u (%x)\n", total_packet_count(),
173 total_packet_count());
174 printf("=== Perf test done ===\n\n");
179 /* Useful function which ensures that all worker functions terminate */
181 quit_workers(struct rte_distributor *d, struct rte_mempool *p)
183 const unsigned int num_workers = rte_lcore_count() - 1;
185 struct rte_mbuf *bufs[RTE_MAX_LCORE];
187 rte_mempool_get_bulk(p, (void *)bufs, num_workers);
190 for (i = 0; i < num_workers; i++)
191 bufs[i]->hash.usr = i << 1;
192 rte_distributor_process(d, bufs, num_workers);
194 rte_mempool_put_bulk(p, (void *)bufs, num_workers);
196 rte_distributor_process(d, NULL, 0);
197 rte_eal_mp_wait_lcore();
203 test_distributor_perf(void)
205 static struct rte_distributor *ds;
206 static struct rte_distributor *db;
207 static struct rte_mempool *p;
209 if (rte_lcore_count() < 2) {
210 printf("ERROR: not enough cores to test distributor\n");
214 /* first time how long it takes to round-trip a cache line */
215 time_cache_line_switch();
218 ds = rte_distributor_create("Test_perf", rte_socket_id(),
219 rte_lcore_count() - 1,
220 RTE_DIST_ALG_SINGLE);
222 printf("Error creating distributor\n");
226 rte_distributor_clear_returns(ds);
230 db = rte_distributor_create("Test_burst", rte_socket_id(),
231 rte_lcore_count() - 1,
234 printf("Error creating burst distributor\n");
238 rte_distributor_clear_returns(db);
241 const unsigned nb_bufs = (511 * rte_lcore_count()) < BIG_BATCH ?
242 (BIG_BATCH * 2) - 1 : (511 * rte_lcore_count());
244 p = rte_pktmbuf_pool_create("DPT_MBUF_POOL", nb_bufs, BURST,
245 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
247 printf("Error creating mempool\n");
252 printf("=== Performance test of distributor (single mode) ===\n");
253 rte_eal_mp_remote_launch(handle_work, ds, SKIP_MASTER);
254 if (perf_test(ds, p) < 0)
258 printf("=== Performance test of distributor (burst mode) ===\n");
259 rte_eal_mp_remote_launch(handle_work, db, SKIP_MASTER);
260 if (perf_test(db, p) < 0)
267 REGISTER_TEST_COMMAND(distributor_perf_autotest, test_distributor_perf);