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42 * The objective of the timer stress tests is to check that there are no
43 * race conditions in list and status management. This test launches,
44 * resets and stops the timer very often on many cores at the same
47 * - Only one timer is used for this test.
48 * - On each core, the rte_timer_manage() function is called from the main
49 * loop every 3 microseconds.
50 * - In the main loop, the timer may be reset (randomly, with a
51 * probability of 0.5 %) 100 microseconds later on a random core, or
52 * stopped (with a probability of 0.5 % also).
53 * - In callback, the timer is can be reset (randomly, with a
54 * probability of 0.5 %) 100 microseconds later on the same core or
55 * on another core (same probability), or stopped (same
60 * The objective of this test is similar to the first in that it attempts
61 * to find if there are any race conditions in the timer library. However,
62 * it is less complex in terms of operations performed and duration, as it
63 * is designed to have a predictable outcome that can be tested.
65 * - A set of timers is initialized for use by the test
66 * - All cores then simultaneously are set to schedule all the timers at
67 * the same time, so conflicts should occur.
68 * - Then there is a delay while we wait for the timers to expire
69 * - Then the master lcore calls timer_manage() and we check that all
70 * timers have had their callbacks called exactly once - no more no less.
71 * - Then we repeat the process, except after setting up the timers, we have
72 * all cores randomly reschedule them.
73 * - Again we check that the expected number of callbacks has occurred when
74 * we call timer-manage.
78 * This test performs basic functional checks of the timers. The test
79 * uses four different timers that are loaded and stopped under
80 * specific conditions in specific contexts.
82 * - Four timers are used for this test.
83 * - On each core, the rte_timer_manage() function is called from main loop
84 * every 3 microseconds.
86 * The autotest python script checks that the behavior is correct:
90 * - At initialization, timer0 is loaded by the master core, on master core
91 * in "single" mode (time = 1 second).
92 * - In the first 19 callbacks, timer0 is reloaded on the same core,
93 * then, it is explicitly stopped at the 20th call.
94 * - At t=25s, timer0 is reloaded once by timer2.
98 * - At initialization, timer1 is loaded by the master core, on the
99 * master core in "single" mode (time = 2 seconds).
100 * - In the first 9 callbacks, timer1 is reloaded on another
101 * core. After the 10th callback, timer1 is not reloaded anymore.
105 * - At initialization, timer2 is loaded by the master core, on the
106 * master core in "periodical" mode (time = 1 second).
107 * - In the callback, when t=25s, it stops timer3 and reloads timer0
108 * on the current core.
112 * - At initialization, timer3 is loaded by the master core, on
113 * another core in "periodical" mode (time = 1 second).
114 * - It is stopped at t=25s by timer2.
122 #include <inttypes.h>
123 #include <sys/queue.h>
126 #include <rte_common.h>
128 #include <rte_memory.h>
129 #include <rte_memzone.h>
130 #include <rte_launch.h>
131 #include <rte_cycles.h>
132 #include <rte_tailq.h>
134 #include <rte_per_lcore.h>
135 #include <rte_lcore.h>
136 #include <rte_atomic.h>
137 #include <rte_timer.h>
138 #include <rte_random.h>
139 #include <rte_malloc.h>
142 #define TEST_DURATION_S 20 /* in seconds */
145 #define RTE_LOGTYPE_TESTTIMER RTE_LOGTYPE_USER3
147 static volatile uint64_t end_time;
150 struct rte_timer tim;
155 static struct mytimerinfo mytiminfo[NB_TIMER];
157 static void timer_basic_cb(struct rte_timer *tim, void *arg);
160 mytimer_reset(struct mytimerinfo *timinfo, uint64_t ticks,
161 enum rte_timer_type type, unsigned tim_lcore,
164 rte_timer_reset_sync(&timinfo->tim, ticks, type, tim_lcore,
168 /* timer callback for stress tests */
170 timer_stress_cb(__attribute__((unused)) struct rte_timer *tim,
171 __attribute__((unused)) void *arg)
174 unsigned lcore_id = rte_lcore_id();
175 uint64_t hz = rte_get_timer_hz();
177 if (rte_timer_pending(tim))
181 if ((r & 0xff) == 0) {
182 mytimer_reset(&mytiminfo[0], hz, SINGLE, lcore_id,
185 else if ((r & 0xff) == 1) {
186 mytimer_reset(&mytiminfo[0], hz, SINGLE,
187 rte_get_next_lcore(lcore_id, 0, 1),
190 else if ((r & 0xff) == 2) {
191 rte_timer_stop(&mytiminfo[0].tim);
196 timer_stress_main_loop(__attribute__((unused)) void *arg)
198 uint64_t hz = rte_get_timer_hz();
199 unsigned lcore_id = rte_lcore_id();
206 /* call the timer handler on each core */
209 /* simulate the processing of a packet
210 * (1 us = 2000 cycles at 2 Ghz) */
213 /* randomly stop or reset timer */
215 lcore_id = rte_get_next_lcore(lcore_id, 0, 1);
216 if ((r & 0xff) == 0) {
218 mytimer_reset(&mytiminfo[0], hz/10000, SINGLE, lcore_id,
221 else if ((r & 0xff) == 1) {
222 rte_timer_stop_sync(&mytiminfo[0].tim);
224 cur_time = rte_get_timer_cycles();
225 diff = end_time - cur_time;
228 lcore_id = rte_lcore_id();
229 RTE_LOG(INFO, TESTTIMER, "core %u finished\n", lcore_id);
234 static volatile int cb_count = 0;
236 /* callback for second stress test. will only be called
239 timer_stress2_cb(struct rte_timer *tim __rte_unused, void *arg __rte_unused)
244 #define NB_STRESS2_TIMERS 8192
247 timer_stress2_main_loop(__attribute__((unused)) void *arg)
249 static struct rte_timer *timers;
251 static volatile int ready = 0;
252 uint64_t delay = rte_get_timer_hz() / 4;
253 unsigned lcore_id = rte_lcore_id();
254 int32_t my_collisions = 0;
255 static rte_atomic32_t collisions = RTE_ATOMIC32_INIT(0);
257 if (lcore_id == rte_get_master_lcore()) {
259 timers = rte_malloc(NULL, sizeof(*timers) * NB_STRESS2_TIMERS, 0);
260 if (timers == NULL) {
261 printf("Test Failed\n");
262 printf("- Cannot allocate memory for timers\n" );
265 for (i = 0; i < NB_STRESS2_TIMERS; i++)
266 rte_timer_init(&timers[i]);
273 /* have all cores schedule all timers on master lcore */
274 for (i = 0; i < NB_STRESS2_TIMERS; i++) {
275 ret = rte_timer_reset(&timers[i], delay, SINGLE, rte_get_master_lcore(),
276 timer_stress2_cb, NULL);
277 /* there will be collisions when multiple cores simultaneously
278 * configure the same timers */
282 if (my_collisions != 0)
283 rte_atomic32_add(&collisions, my_collisions);
288 /* now check that we get the right number of callbacks */
289 if (lcore_id == rte_get_master_lcore()) {
290 my_collisions = rte_atomic32_read(&collisions);
291 if (my_collisions != 0)
292 printf("- %d timer reset collisions (OK)\n", my_collisions);
294 if (cb_count != NB_STRESS2_TIMERS) {
295 printf("Test Failed\n");
296 printf("- Stress test 2, part 1 failed\n");
297 printf("- Expected %d callbacks, got %d\n", NB_STRESS2_TIMERS,
307 /* now test again, just stop and restart timers at random after init*/
308 for (i = 0; i < NB_STRESS2_TIMERS; i++)
309 rte_timer_reset(&timers[i], delay, SINGLE, rte_get_master_lcore(),
310 timer_stress2_cb, NULL);
313 /* pick random timer to reset, stopping them first half the time */
314 for (i = 0; i < 100000; i++) {
315 int r = rand() % NB_STRESS2_TIMERS;
317 rte_timer_stop(&timers[r]);
318 rte_timer_reset(&timers[r], delay, SINGLE, rte_get_master_lcore(),
319 timer_stress2_cb, NULL);
324 /* now check that we get the right number of callbacks */
325 if (lcore_id == rte_get_master_lcore()) {
328 /* clean up statics, in case we run again */
332 rte_atomic32_set(&collisions, 0);
334 if (cb_count != NB_STRESS2_TIMERS) {
335 printf("Test Failed\n");
336 printf("- Stress test 2, part 2 failed\n");
337 printf("- Expected %d callbacks, got %d\n", NB_STRESS2_TIMERS,
347 /* timer callback for basic tests */
349 timer_basic_cb(struct rte_timer *tim, void *arg)
351 struct mytimerinfo *timinfo = arg;
352 uint64_t hz = rte_get_timer_hz();
353 unsigned lcore_id = rte_lcore_id();
354 uint64_t cur_time = rte_get_timer_cycles();
356 if (rte_timer_pending(tim))
361 RTE_LOG(INFO, TESTTIMER,
362 "%"PRIu64": callback id=%u count=%u on core %u\n",
363 cur_time, timinfo->id, timinfo->count, lcore_id);
365 /* reload timer 0 on same core */
366 if (timinfo->id == 0 && timinfo->count < 20) {
367 mytimer_reset(timinfo, hz, SINGLE, lcore_id, timer_basic_cb);
371 /* reload timer 1 on next core */
372 if (timinfo->id == 1 && timinfo->count < 10) {
373 mytimer_reset(timinfo, hz*2, SINGLE,
374 rte_get_next_lcore(lcore_id, 0, 1),
379 /* Explicitelly stop timer 0. Once stop() called, we can even
380 * erase the content of the structure: it is not referenced
381 * anymore by any code (in case of dynamic structure, it can
383 if (timinfo->id == 0 && timinfo->count == 20) {
385 /* stop_sync() is not needed, because we know that the
386 * status of timer is only modified by this core */
388 memset(tim, 0xAA, sizeof(struct rte_timer));
392 /* stop timer3, and restart a new timer0 (it was removed 5
393 * seconds ago) for a single shot */
394 if (timinfo->id == 2 && timinfo->count == 25) {
395 rte_timer_stop_sync(&mytiminfo[3].tim);
397 /* need to reinit because structure was erased with 0xAA */
398 rte_timer_init(&mytiminfo[0].tim);
399 mytimer_reset(&mytiminfo[0], hz, SINGLE, lcore_id,
405 timer_basic_main_loop(__attribute__((unused)) void *arg)
407 uint64_t hz = rte_get_timer_hz();
408 unsigned lcore_id = rte_lcore_id();
412 /* launch all timers on core 0 */
413 if (lcore_id == rte_get_master_lcore()) {
414 mytimer_reset(&mytiminfo[0], hz, SINGLE, lcore_id,
416 mytimer_reset(&mytiminfo[1], hz*2, SINGLE, lcore_id,
418 mytimer_reset(&mytiminfo[2], hz, PERIODICAL, lcore_id,
420 mytimer_reset(&mytiminfo[3], hz, PERIODICAL,
421 rte_get_next_lcore(lcore_id, 0, 1),
427 /* call the timer handler on each core */
430 /* simulate the processing of a packet
431 * (3 us = 6000 cycles at 2 Ghz) */
434 cur_time = rte_get_timer_cycles();
435 diff = end_time - cur_time;
437 RTE_LOG(INFO, TESTTIMER, "core %u finished\n", lcore_id);
443 timer_sanity_check(void)
445 #ifdef RTE_LIBEAL_USE_HPET
446 if (eal_timer_source != EAL_TIMER_HPET) {
447 printf("Not using HPET, can't sanity check timer sources\n");
451 const uint64_t t_hz = rte_get_tsc_hz();
452 const uint64_t h_hz = rte_get_hpet_hz();
453 printf("Hertz values: TSC = %"PRIu64", HPET = %"PRIu64"\n", t_hz, h_hz);
455 const uint64_t tsc_start = rte_get_tsc_cycles();
456 const uint64_t hpet_start = rte_get_hpet_cycles();
457 rte_delay_ms(100); /* delay 1/10 second */
458 const uint64_t tsc_end = rte_get_tsc_cycles();
459 const uint64_t hpet_end = rte_get_hpet_cycles();
460 printf("Measured cycles: TSC = %"PRIu64", HPET = %"PRIu64"\n",
461 tsc_end-tsc_start, hpet_end-hpet_start);
463 const double tsc_time = (double)(tsc_end - tsc_start)/t_hz;
464 const double hpet_time = (double)(hpet_end - hpet_start)/h_hz;
465 /* get the percentage that the times differ by */
466 const double time_diff = fabs(tsc_time - hpet_time)*100/tsc_time;
467 printf("Measured time: TSC = %.4f, HPET = %.4f\n", tsc_time, hpet_time);
469 printf("Elapsed time measured by TSC and HPET differ by %f%%\n",
471 if (time_diff > 0.1) {
472 printf("Error times differ by >0.1%%");
486 /* sanity check our timer sources and timer config values */
487 if (timer_sanity_check() < 0) {
488 printf("Timer sanity checks failed\n");
492 if (rte_lcore_count() < 2) {
493 printf("not enough lcores for this test\n");
498 for (i=0; i<NB_TIMER; i++) {
499 memset(&mytiminfo[i], 0, sizeof(struct mytimerinfo));
501 rte_timer_init(&mytiminfo[i].tim);
504 /* calculate the "end of test" time */
505 cur_time = rte_get_timer_cycles();
506 hz = rte_get_timer_hz();
507 end_time = cur_time + (hz * TEST_DURATION_S);
509 /* start other cores */
510 printf("Start timer stress tests (%d seconds)\n", TEST_DURATION_S);
511 rte_eal_mp_remote_launch(timer_stress_main_loop, NULL, CALL_MASTER);
512 rte_eal_mp_wait_lcore();
514 /* stop timer 0 used for stress test */
515 rte_timer_stop_sync(&mytiminfo[0].tim);
517 /* run a second, slightly different set of stress tests */
518 printf("Start timer stress tests 2\n");
519 rte_eal_mp_remote_launch(timer_stress2_main_loop, NULL, CALL_MASTER);
520 rte_eal_mp_wait_lcore();
522 /* calculate the "end of test" time */
523 cur_time = rte_get_timer_cycles();
524 hz = rte_get_timer_hz();
525 end_time = cur_time + (hz * TEST_DURATION_S);
527 /* start other cores */
528 printf("Start timer basic tests (%d seconds)\n", TEST_DURATION_S);
529 rte_eal_mp_remote_launch(timer_basic_main_loop, NULL, CALL_MASTER);
530 rte_eal_mp_wait_lcore();
532 /* stop all timers */
533 for (i=0; i<NB_TIMER; i++) {
534 rte_timer_stop_sync(&mytiminfo[i].tim);
537 rte_timer_dump_stats(stdout);
542 static struct test_command timer_cmd = {
543 .command = "timer_autotest",
544 .callback = test_timer,
546 REGISTER_TEST_COMMAND(timer_cmd);