1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2017 Intel Corporation 3 */ 4 5 #include "test.h" 6 7 #include <unistd.h> 8 #include <string.h> 9 #include <rte_mempool.h> 10 #include <rte_cycles.h> 11 #include <rte_common.h> 12 #include <rte_mbuf.h> 13 14 #ifdef RTE_EXEC_ENV_WINDOWS 15 static int 16 test_distributor_perf(void) 17 { 18 printf("distributor perf not supported on Windows, skipping test\n"); 19 return TEST_SKIPPED; 20 } 21 22 #else 23 24 #include <rte_distributor.h> 25 #include <rte_pause.h> 26 27 #define ITER_POWER_CL 25 /* log 2 of how many iterations for Cache Line test */ 28 #define ITER_POWER 21 /* log 2 of how many iterations we do when timing. */ 29 #define BURST 64 30 #define BIG_BATCH 1024 31 32 /* static vars - zero initialized by default */ 33 static volatile int quit; 34 static volatile unsigned worker_idx; 35 36 struct worker_stats { 37 volatile unsigned handled_packets; 38 } __rte_cache_aligned; 39 static struct worker_stats worker_stats[RTE_MAX_LCORE]; 40 41 /* 42 * worker thread used for testing the time to do a round-trip of a cache 43 * line between two cores and back again 44 */ 45 static int 46 flip_bit(volatile uint64_t *arg) 47 { 48 uint64_t old_val = 0; 49 while (old_val != 2) { 50 while (!*arg) 51 rte_pause(); 52 old_val = *arg; 53 *arg = 0; 54 } 55 return 0; 56 } 57 58 /* 59 * test case to time the number of cycles to round-trip a cache line between 60 * two cores and back again. 61 */ 62 static void 63 time_cache_line_switch(void) 64 { 65 /* allocate a full cache line for data, we use only first byte of it */ 66 uint64_t data[RTE_CACHE_LINE_SIZE*3 / sizeof(uint64_t)]; 67 68 unsigned int i, workerid = rte_get_next_lcore(rte_lcore_id(), 0, 0); 69 volatile uint64_t *pdata = &data[0]; 70 *pdata = 1; 71 rte_eal_remote_launch((lcore_function_t *)flip_bit, &data[0], workerid); 72 while (*pdata) 73 rte_pause(); 74 75 const uint64_t start_time = rte_rdtsc(); 76 for (i = 0; i < (1 << ITER_POWER_CL); i++) { 77 while (*pdata) 78 rte_pause(); 79 *pdata = 1; 80 } 81 const uint64_t end_time = rte_rdtsc(); 82 83 while (*pdata) 84 rte_pause(); 85 *pdata = 2; 86 rte_eal_wait_lcore(workerid); 87 printf("==== Cache line switch test ===\n"); 88 printf("Time for %u iterations = %"PRIu64" ticks\n", (1<<ITER_POWER_CL), 89 end_time-start_time); 90 printf("Ticks per iteration = %"PRIu64"\n\n", 91 (end_time-start_time) >> ITER_POWER_CL); 92 } 93 94 /* 95 * returns the total count of the number of packets handled by the worker 96 * functions given below. 97 */ 98 static unsigned 99 total_packet_count(void) 100 { 101 unsigned i, count = 0; 102 for (i = 0; i < worker_idx; i++) 103 count += worker_stats[i].handled_packets; 104 return count; 105 } 106 107 /* resets the packet counts for a new test */ 108 static void 109 clear_packet_count(void) 110 { 111 memset(&worker_stats, 0, sizeof(worker_stats)); 112 } 113 114 /* 115 * This is the basic worker function for performance tests. 116 * it does nothing but return packets and count them. 117 */ 118 static int 119 handle_work(void *arg) 120 { 121 struct rte_distributor *d = arg; 122 unsigned int num = 0; 123 int i; 124 unsigned int id = __atomic_fetch_add(&worker_idx, 1, __ATOMIC_RELAXED); 125 struct rte_mbuf *buf[8] __rte_cache_aligned; 126 127 for (i = 0; i < 8; i++) 128 buf[i] = NULL; 129 130 num = rte_distributor_get_pkt(d, id, buf, buf, num); 131 while (!quit) { 132 worker_stats[id].handled_packets += num; 133 num = rte_distributor_get_pkt(d, id, buf, buf, num); 134 } 135 worker_stats[id].handled_packets += num; 136 rte_distributor_return_pkt(d, id, buf, num); 137 return 0; 138 } 139 140 /* 141 * This basic performance test just repeatedly sends in 32 packets at a time 142 * to the distributor and verifies at the end that we got them all in the worker 143 * threads and finally how long per packet the processing took. 144 */ 145 static inline int 146 perf_test(struct rte_distributor *d, struct rte_mempool *p) 147 { 148 unsigned int i; 149 uint64_t start, end; 150 struct rte_mbuf *bufs[BURST]; 151 152 clear_packet_count(); 153 if (rte_mempool_get_bulk(p, (void *)bufs, BURST) != 0) { 154 printf("Error getting mbufs from pool\n"); 155 return -1; 156 } 157 /* ensure we have different hash value for each pkt */ 158 for (i = 0; i < BURST; i++) 159 bufs[i]->hash.usr = i; 160 161 start = rte_rdtsc(); 162 for (i = 0; i < (1<<ITER_POWER); i++) 163 rte_distributor_process(d, bufs, BURST); 164 end = rte_rdtsc(); 165 166 do { 167 usleep(100); 168 rte_distributor_process(d, NULL, 0); 169 } while (total_packet_count() < (BURST << ITER_POWER)); 170 171 rte_distributor_clear_returns(d); 172 173 printf("Time per burst: %"PRIu64"\n", (end - start) >> ITER_POWER); 174 printf("Time per packet: %"PRIu64"\n\n", 175 ((end - start) >> ITER_POWER)/BURST); 176 rte_mempool_put_bulk(p, (void *)bufs, BURST); 177 178 for (i = 0; i < rte_lcore_count() - 1; i++) 179 printf("Worker %u handled %u packets\n", i, 180 worker_stats[i].handled_packets); 181 printf("Total packets: %u (%x)\n", total_packet_count(), 182 total_packet_count()); 183 printf("=== Perf test done ===\n\n"); 184 185 return 0; 186 } 187 188 /* Useful function which ensures that all worker functions terminate */ 189 static void 190 quit_workers(struct rte_distributor *d, struct rte_mempool *p) 191 { 192 const unsigned int num_workers = rte_lcore_count() - 1; 193 unsigned int i; 194 struct rte_mbuf *bufs[RTE_MAX_LCORE]; 195 196 rte_mempool_get_bulk(p, (void *)bufs, num_workers); 197 198 quit = 1; 199 for (i = 0; i < num_workers; i++) { 200 bufs[i]->hash.usr = i << 1; 201 rte_distributor_process(d, &bufs[i], 1); 202 } 203 204 rte_mempool_put_bulk(p, (void *)bufs, num_workers); 205 206 rte_distributor_process(d, NULL, 0); 207 rte_distributor_flush(d); 208 rte_eal_mp_wait_lcore(); 209 quit = 0; 210 worker_idx = 0; 211 } 212 213 static int 214 test_distributor_perf(void) 215 { 216 static struct rte_distributor *ds; 217 static struct rte_distributor *db; 218 static struct rte_mempool *p; 219 220 if (rte_lcore_count() < 2) { 221 printf("Not enough cores for distributor_perf_autotest, expecting at least 2\n"); 222 return TEST_SKIPPED; 223 } 224 225 /* first time how long it takes to round-trip a cache line */ 226 time_cache_line_switch(); 227 228 if (ds == NULL) { 229 ds = rte_distributor_create("Test_perf", rte_socket_id(), 230 rte_lcore_count() - 1, 231 RTE_DIST_ALG_SINGLE); 232 if (ds == NULL) { 233 printf("Error creating distributor\n"); 234 return -1; 235 } 236 } else { 237 rte_distributor_clear_returns(ds); 238 } 239 240 if (db == NULL) { 241 db = rte_distributor_create("Test_burst", rte_socket_id(), 242 rte_lcore_count() - 1, 243 RTE_DIST_ALG_BURST); 244 if (db == NULL) { 245 printf("Error creating burst distributor\n"); 246 return -1; 247 } 248 } else { 249 rte_distributor_clear_returns(db); 250 } 251 252 const unsigned nb_bufs = (511 * rte_lcore_count()) < BIG_BATCH ? 253 (BIG_BATCH * 2) - 1 : (511 * rte_lcore_count()); 254 if (p == NULL) { 255 p = rte_pktmbuf_pool_create("DPT_MBUF_POOL", nb_bufs, BURST, 256 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id()); 257 if (p == NULL) { 258 printf("Error creating mempool\n"); 259 return -1; 260 } 261 } 262 263 printf("=== Performance test of distributor (single mode) ===\n"); 264 rte_eal_mp_remote_launch(handle_work, ds, SKIP_MAIN); 265 if (perf_test(ds, p) < 0) 266 return -1; 267 quit_workers(ds, p); 268 269 printf("=== Performance test of distributor (burst mode) ===\n"); 270 rte_eal_mp_remote_launch(handle_work, db, SKIP_MAIN); 271 if (perf_test(db, p) < 0) 272 return -1; 273 quit_workers(db, p); 274 275 return 0; 276 } 277 278 #endif /* !RTE_EXEC_ENV_WINDOWS */ 279 280 REGISTER_TEST_COMMAND(distributor_perf_autotest, test_distributor_perf); 281