1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2017 Intel Corporation
12 #include <rte_ethdev.h>
13 #include <rte_cycles.h>
14 #include <rte_malloc.h>
15 #include <rte_debug.h>
16 #include <rte_prefetch.h>
17 #include <rte_distributor.h>
18 #include <rte_pause.h>
20 #define RX_RING_SIZE 1024
21 #define TX_RING_SIZE 1024
22 #define NUM_MBUFS ((64*1024)-1)
23 #define MBUF_CACHE_SIZE 128
25 #define SCHED_RX_RING_SZ 8192
26 #define SCHED_TX_RING_SZ 65536
27 #define BURST_SIZE_TX 32
29 #define RTE_LOGTYPE_DISTRAPP RTE_LOGTYPE_USER1
31 #define ANSI_COLOR_RED "\x1b[31m"
32 #define ANSI_COLOR_RESET "\x1b[0m"
34 /* mask of enabled ports */
35 static uint32_t enabled_port_mask;
36 volatile uint8_t quit_signal;
37 volatile uint8_t quit_signal_rx;
38 volatile uint8_t quit_signal_dist;
39 volatile uint8_t quit_signal_work;
41 static volatile struct app_stats {
44 uint64_t returned_pkts;
45 uint64_t enqueued_pkts;
46 uint64_t enqdrop_pkts;
47 } rx __rte_cache_aligned;
48 int pad1 __rte_cache_aligned;
54 uint64_t enqdrop_pkts;
55 } dist __rte_cache_aligned;
56 int pad2 __rte_cache_aligned;
59 uint64_t dequeue_pkts;
61 uint64_t enqdrop_pkts;
62 } tx __rte_cache_aligned;
63 int pad3 __rte_cache_aligned;
65 uint64_t worker_pkts[64] __rte_cache_aligned;
67 int pad4 __rte_cache_aligned;
69 uint64_t worker_bursts[64][8] __rte_cache_aligned;
71 int pad5 __rte_cache_aligned;
73 uint64_t port_rx_pkts[64] __rte_cache_aligned;
74 uint64_t port_tx_pkts[64] __rte_cache_aligned;
77 struct app_stats prev_app_stats;
79 static const struct rte_eth_conf port_conf_default = {
81 .mq_mode = ETH_MQ_RX_RSS,
82 .max_rx_pkt_len = ETHER_MAX_LEN,
85 .mq_mode = ETH_MQ_TX_NONE,
89 .rss_hf = ETH_RSS_IP | ETH_RSS_UDP |
90 ETH_RSS_TCP | ETH_RSS_SCTP,
95 struct output_buffer {
97 struct rte_mbuf *mbufs[BURST_SIZE];
100 static void print_stats(void);
103 * Initialises a given port using global settings and with the rx buffers
104 * coming from the mbuf_pool passed as parameter
107 port_init(uint16_t port, struct rte_mempool *mbuf_pool)
109 struct rte_eth_conf port_conf = port_conf_default;
110 const uint16_t rxRings = 1, txRings = rte_lcore_count() - 1;
113 uint16_t nb_rxd = RX_RING_SIZE;
114 uint16_t nb_txd = TX_RING_SIZE;
115 struct rte_eth_dev_info dev_info;
116 struct rte_eth_txconf txconf;
118 if (!rte_eth_dev_is_valid_port(port))
121 rte_eth_dev_info_get(port, &dev_info);
122 if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
123 port_conf.txmode.offloads |=
124 DEV_TX_OFFLOAD_MBUF_FAST_FREE;
126 retval = rte_eth_dev_configure(port, rxRings, txRings, &port_conf);
130 retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
134 for (q = 0; q < rxRings; q++) {
135 retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
136 rte_eth_dev_socket_id(port),
142 txconf = dev_info.default_txconf;
143 txconf.offloads = port_conf.txmode.offloads;
144 for (q = 0; q < txRings; q++) {
145 retval = rte_eth_tx_queue_setup(port, q, nb_txd,
146 rte_eth_dev_socket_id(port),
152 retval = rte_eth_dev_start(port);
156 struct rte_eth_link link;
157 rte_eth_link_get_nowait(port, &link);
158 while (!link.link_status) {
159 printf("Waiting for Link up on port %"PRIu16"\n", port);
161 rte_eth_link_get_nowait(port, &link);
164 if (!link.link_status) {
165 printf("Link down on port %"PRIu16"\n", port);
169 struct ether_addr addr;
170 rte_eth_macaddr_get(port, &addr);
171 printf("Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
172 " %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
174 addr.addr_bytes[0], addr.addr_bytes[1],
175 addr.addr_bytes[2], addr.addr_bytes[3],
176 addr.addr_bytes[4], addr.addr_bytes[5]);
178 rte_eth_promiscuous_enable(port);
183 struct lcore_params {
185 struct rte_distributor *d;
186 struct rte_ring *rx_dist_ring;
187 struct rte_ring *dist_tx_ring;
188 struct rte_mempool *mem_pool;
192 lcore_rx(struct lcore_params *p)
194 const uint16_t nb_ports = rte_eth_dev_count_avail();
195 const int socket_id = rte_socket_id();
197 struct rte_mbuf *bufs[BURST_SIZE*2];
199 RTE_ETH_FOREACH_DEV(port) {
200 /* skip ports that are not enabled */
201 if ((enabled_port_mask & (1 << port)) == 0)
204 if (rte_eth_dev_socket_id(port) > 0 &&
205 rte_eth_dev_socket_id(port) != socket_id)
206 printf("WARNING, port %u is on remote NUMA node to "
207 "RX thread.\n\tPerformance will not "
208 "be optimal.\n", port);
211 printf("\nCore %u doing packet RX.\n", rte_lcore_id());
213 while (!quit_signal_rx) {
215 /* skip ports that are not enabled */
216 if ((enabled_port_mask & (1 << port)) == 0) {
217 if (++port == nb_ports)
221 const uint16_t nb_rx = rte_eth_rx_burst(port, 0, bufs,
223 if (unlikely(nb_rx == 0)) {
224 if (++port == nb_ports)
228 app_stats.rx.rx_pkts += nb_rx;
231 * You can run the distributor on the rx core with this code. Returned
232 * packets are then send straight to the tx core.
235 rte_distributor_process(d, bufs, nb_rx);
236 const uint16_t nb_ret = rte_distributor_returned_pktsd,
239 app_stats.rx.returned_pkts += nb_ret;
240 if (unlikely(nb_ret == 0)) {
241 if (++port == nb_ports)
246 struct rte_ring *tx_ring = p->dist_tx_ring;
247 uint16_t sent = rte_ring_enqueue_burst(tx_ring,
248 (void *)bufs, nb_ret, NULL);
250 uint16_t nb_ret = nb_rx;
252 * Swap the following two lines if you want the rx traffic
253 * to go directly to tx, no distribution.
255 struct rte_ring *out_ring = p->rx_dist_ring;
256 /* struct rte_ring *out_ring = p->dist_tx_ring; */
258 uint16_t sent = rte_ring_enqueue_burst(out_ring,
259 (void *)bufs, nb_ret, NULL);
262 app_stats.rx.enqueued_pkts += sent;
263 if (unlikely(sent < nb_ret)) {
264 app_stats.rx.enqdrop_pkts += nb_ret - sent;
265 RTE_LOG_DP(DEBUG, DISTRAPP,
266 "%s:Packet loss due to full ring\n", __func__);
267 while (sent < nb_ret)
268 rte_pktmbuf_free(bufs[sent++]);
270 if (++port == nb_ports)
273 /* set worker & tx threads quit flag */
274 printf("\nCore %u exiting rx task.\n", rte_lcore_id());
280 flush_one_port(struct output_buffer *outbuf, uint8_t outp)
282 unsigned int nb_tx = rte_eth_tx_burst(outp, 0,
283 outbuf->mbufs, outbuf->count);
284 app_stats.tx.tx_pkts += outbuf->count;
286 if (unlikely(nb_tx < outbuf->count)) {
287 app_stats.tx.enqdrop_pkts += outbuf->count - nb_tx;
289 rte_pktmbuf_free(outbuf->mbufs[nb_tx]);
290 } while (++nb_tx < outbuf->count);
296 flush_all_ports(struct output_buffer *tx_buffers)
300 RTE_ETH_FOREACH_DEV(outp) {
301 /* skip ports that are not enabled */
302 if ((enabled_port_mask & (1 << outp)) == 0)
305 if (tx_buffers[outp].count == 0)
308 flush_one_port(&tx_buffers[outp], outp);
315 lcore_distributor(struct lcore_params *p)
317 struct rte_ring *in_r = p->rx_dist_ring;
318 struct rte_ring *out_r = p->dist_tx_ring;
319 struct rte_mbuf *bufs[BURST_SIZE * 4];
320 struct rte_distributor *d = p->d;
322 printf("\nCore %u acting as distributor core.\n", rte_lcore_id());
323 while (!quit_signal_dist) {
324 const uint16_t nb_rx = rte_ring_dequeue_burst(in_r,
325 (void *)bufs, BURST_SIZE*1, NULL);
327 app_stats.dist.in_pkts += nb_rx;
329 /* Distribute the packets */
330 rte_distributor_process(d, bufs, nb_rx);
332 const uint16_t nb_ret =
333 rte_distributor_returned_pkts(d,
336 if (unlikely(nb_ret == 0))
338 app_stats.dist.ret_pkts += nb_ret;
340 uint16_t sent = rte_ring_enqueue_burst(out_r,
341 (void *)bufs, nb_ret, NULL);
342 app_stats.dist.sent_pkts += sent;
343 if (unlikely(sent < nb_ret)) {
344 app_stats.dist.enqdrop_pkts += nb_ret - sent;
345 RTE_LOG(DEBUG, DISTRAPP,
346 "%s:Packet loss due to full out ring\n",
348 while (sent < nb_ret)
349 rte_pktmbuf_free(bufs[sent++]);
353 printf("\nCore %u exiting distributor task.\n", rte_lcore_id());
354 quit_signal_work = 1;
356 rte_distributor_flush(d);
357 /* Unblock any returns so workers can exit */
358 rte_distributor_clear_returns(d);
365 lcore_tx(struct rte_ring *in_r)
367 static struct output_buffer tx_buffers[RTE_MAX_ETHPORTS];
368 const int socket_id = rte_socket_id();
371 RTE_ETH_FOREACH_DEV(port) {
372 /* skip ports that are not enabled */
373 if ((enabled_port_mask & (1 << port)) == 0)
376 if (rte_eth_dev_socket_id(port) > 0 &&
377 rte_eth_dev_socket_id(port) != socket_id)
378 printf("WARNING, port %u is on remote NUMA node to "
379 "TX thread.\n\tPerformance will not "
380 "be optimal.\n", port);
383 printf("\nCore %u doing packet TX.\n", rte_lcore_id());
384 while (!quit_signal) {
386 RTE_ETH_FOREACH_DEV(port) {
387 /* skip ports that are not enabled */
388 if ((enabled_port_mask & (1 << port)) == 0)
391 struct rte_mbuf *bufs[BURST_SIZE_TX];
392 const uint16_t nb_rx = rte_ring_dequeue_burst(in_r,
393 (void *)bufs, BURST_SIZE_TX, NULL);
394 app_stats.tx.dequeue_pkts += nb_rx;
396 /* if we get no traffic, flush anything we have */
397 if (unlikely(nb_rx == 0)) {
398 flush_all_ports(tx_buffers);
402 /* for traffic we receive, queue it up for transmit */
404 rte_prefetch_non_temporal((void *)bufs[0]);
405 rte_prefetch_non_temporal((void *)bufs[1]);
406 rte_prefetch_non_temporal((void *)bufs[2]);
407 for (i = 0; i < nb_rx; i++) {
408 struct output_buffer *outbuf;
410 rte_prefetch_non_temporal((void *)bufs[i + 3]);
412 * workers should update in_port to hold the
415 outp = bufs[i]->port;
416 /* skip ports that are not enabled */
417 if ((enabled_port_mask & (1 << outp)) == 0)
420 outbuf = &tx_buffers[outp];
421 outbuf->mbufs[outbuf->count++] = bufs[i];
422 if (outbuf->count == BURST_SIZE_TX)
423 flush_one_port(outbuf, outp);
427 printf("\nCore %u exiting tx task.\n", rte_lcore_id());
432 int_handler(int sig_num)
434 printf("Exiting on signal %d\n", sig_num);
435 /* set quit flag for rx thread to exit */
436 quit_signal_dist = 1;
442 struct rte_eth_stats eth_stats;
444 const unsigned int num_workers = rte_lcore_count() - 4;
446 RTE_ETH_FOREACH_DEV(i) {
447 rte_eth_stats_get(i, ð_stats);
448 app_stats.port_rx_pkts[i] = eth_stats.ipackets;
449 app_stats.port_tx_pkts[i] = eth_stats.opackets;
452 printf("\n\nRX Thread:\n");
453 RTE_ETH_FOREACH_DEV(i) {
454 printf("Port %u Pktsin : %5.2f\n", i,
455 (app_stats.port_rx_pkts[i] -
456 prev_app_stats.port_rx_pkts[i])/1000000.0);
457 prev_app_stats.port_rx_pkts[i] = app_stats.port_rx_pkts[i];
459 printf(" - Received: %5.2f\n",
460 (app_stats.rx.rx_pkts -
461 prev_app_stats.rx.rx_pkts)/1000000.0);
462 printf(" - Returned: %5.2f\n",
463 (app_stats.rx.returned_pkts -
464 prev_app_stats.rx.returned_pkts)/1000000.0);
465 printf(" - Enqueued: %5.2f\n",
466 (app_stats.rx.enqueued_pkts -
467 prev_app_stats.rx.enqueued_pkts)/1000000.0);
468 printf(" - Dropped: %s%5.2f%s\n", ANSI_COLOR_RED,
469 (app_stats.rx.enqdrop_pkts -
470 prev_app_stats.rx.enqdrop_pkts)/1000000.0,
473 printf("Distributor thread:\n");
474 printf(" - In: %5.2f\n",
475 (app_stats.dist.in_pkts -
476 prev_app_stats.dist.in_pkts)/1000000.0);
477 printf(" - Returned: %5.2f\n",
478 (app_stats.dist.ret_pkts -
479 prev_app_stats.dist.ret_pkts)/1000000.0);
480 printf(" - Sent: %5.2f\n",
481 (app_stats.dist.sent_pkts -
482 prev_app_stats.dist.sent_pkts)/1000000.0);
483 printf(" - Dropped %s%5.2f%s\n", ANSI_COLOR_RED,
484 (app_stats.dist.enqdrop_pkts -
485 prev_app_stats.dist.enqdrop_pkts)/1000000.0,
488 printf("TX thread:\n");
489 printf(" - Dequeued: %5.2f\n",
490 (app_stats.tx.dequeue_pkts -
491 prev_app_stats.tx.dequeue_pkts)/1000000.0);
492 RTE_ETH_FOREACH_DEV(i) {
493 printf("Port %u Pktsout: %5.2f\n",
494 i, (app_stats.port_tx_pkts[i] -
495 prev_app_stats.port_tx_pkts[i])/1000000.0);
496 prev_app_stats.port_tx_pkts[i] = app_stats.port_tx_pkts[i];
498 printf(" - Transmitted: %5.2f\n",
499 (app_stats.tx.tx_pkts -
500 prev_app_stats.tx.tx_pkts)/1000000.0);
501 printf(" - Dropped: %s%5.2f%s\n", ANSI_COLOR_RED,
502 (app_stats.tx.enqdrop_pkts -
503 prev_app_stats.tx.enqdrop_pkts)/1000000.0,
506 prev_app_stats.rx.rx_pkts = app_stats.rx.rx_pkts;
507 prev_app_stats.rx.returned_pkts = app_stats.rx.returned_pkts;
508 prev_app_stats.rx.enqueued_pkts = app_stats.rx.enqueued_pkts;
509 prev_app_stats.rx.enqdrop_pkts = app_stats.rx.enqdrop_pkts;
510 prev_app_stats.dist.in_pkts = app_stats.dist.in_pkts;
511 prev_app_stats.dist.ret_pkts = app_stats.dist.ret_pkts;
512 prev_app_stats.dist.sent_pkts = app_stats.dist.sent_pkts;
513 prev_app_stats.dist.enqdrop_pkts = app_stats.dist.enqdrop_pkts;
514 prev_app_stats.tx.dequeue_pkts = app_stats.tx.dequeue_pkts;
515 prev_app_stats.tx.tx_pkts = app_stats.tx.tx_pkts;
516 prev_app_stats.tx.enqdrop_pkts = app_stats.tx.enqdrop_pkts;
518 for (i = 0; i < num_workers; i++) {
519 printf("Worker %02u Pkts: %5.2f. Bursts(1-8): ", i,
520 (app_stats.worker_pkts[i] -
521 prev_app_stats.worker_pkts[i])/1000000.0);
522 for (j = 0; j < 8; j++) {
523 printf("%"PRIu64" ", app_stats.worker_bursts[i][j]);
524 app_stats.worker_bursts[i][j] = 0;
527 prev_app_stats.worker_pkts[i] = app_stats.worker_pkts[i];
532 lcore_worker(struct lcore_params *p)
534 struct rte_distributor *d = p->d;
535 const unsigned id = p->worker_id;
536 unsigned int num = 0;
540 * for single port, xor_val will be zero so we won't modify the output
541 * port, otherwise we send traffic from 0 to 1, 2 to 3, and vice versa
543 const unsigned xor_val = (rte_eth_dev_count_avail() > 1);
544 struct rte_mbuf *buf[8] __rte_cache_aligned;
546 for (i = 0; i < 8; i++)
549 app_stats.worker_pkts[p->worker_id] = 1;
551 printf("\nCore %u acting as worker core.\n", rte_lcore_id());
552 while (!quit_signal_work) {
553 num = rte_distributor_get_pkt(d, id, buf, buf, num);
554 /* Do a little bit of work for each packet */
555 for (i = 0; i < num; i++) {
556 uint64_t t = rte_rdtsc()+100;
558 while (rte_rdtsc() < t)
560 buf[i]->port ^= xor_val;
563 app_stats.worker_pkts[p->worker_id] += num;
565 app_stats.worker_bursts[p->worker_id][num-1]++;
572 print_usage(const char *prgname)
574 printf("%s [EAL options] -- -p PORTMASK\n"
575 " -p PORTMASK: hexadecimal bitmask of ports to configure\n",
580 parse_portmask(const char *portmask)
585 /* parse hexadecimal string */
586 pm = strtoul(portmask, &end, 16);
587 if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0'))
596 /* Parse the argument given in the command line of the application */
598 parse_args(int argc, char **argv)
603 char *prgname = argv[0];
604 static struct option lgopts[] = {
610 while ((opt = getopt_long(argc, argvopt, "p:",
611 lgopts, &option_index)) != EOF) {
616 enabled_port_mask = parse_portmask(optarg);
617 if (enabled_port_mask == 0) {
618 printf("invalid portmask\n");
619 print_usage(prgname);
625 print_usage(prgname);
631 print_usage(prgname);
635 argv[optind-1] = prgname;
637 optind = 1; /* reset getopt lib */
641 /* Main function, does initialization and calls the per-lcore functions */
643 main(int argc, char *argv[])
645 struct rte_mempool *mbuf_pool;
646 struct rte_distributor *d;
647 struct rte_ring *dist_tx_ring;
648 struct rte_ring *rx_dist_ring;
649 unsigned lcore_id, worker_id = 0;
652 uint16_t nb_ports_available;
655 /* catch ctrl-c so we can print on exit */
656 signal(SIGINT, int_handler);
659 int ret = rte_eal_init(argc, argv);
661 rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
665 /* parse application arguments (after the EAL ones) */
666 ret = parse_args(argc, argv);
668 rte_exit(EXIT_FAILURE, "Invalid distributor parameters\n");
670 if (rte_lcore_count() < 5)
671 rte_exit(EXIT_FAILURE, "Error, This application needs at "
672 "least 5 logical cores to run:\n"
673 "1 lcore for stats (can be core 0)\n"
674 "1 lcore for packet RX\n"
675 "1 lcore for distribution\n"
676 "1 lcore for packet TX\n"
677 "and at least 1 lcore for worker threads\n");
679 nb_ports = rte_eth_dev_count_avail();
681 rte_exit(EXIT_FAILURE, "Error: no ethernet ports detected\n");
682 if (nb_ports != 1 && (nb_ports & 1))
683 rte_exit(EXIT_FAILURE, "Error: number of ports must be even, except "
684 "when using a single port\n");
686 mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL",
687 NUM_MBUFS * nb_ports, MBUF_CACHE_SIZE, 0,
688 RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
689 if (mbuf_pool == NULL)
690 rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
691 nb_ports_available = nb_ports;
693 /* initialize all ports */
694 RTE_ETH_FOREACH_DEV(portid) {
695 /* skip ports that are not enabled */
696 if ((enabled_port_mask & (1 << portid)) == 0) {
697 printf("\nSkipping disabled port %d\n", portid);
698 nb_ports_available--;
702 printf("Initializing port %u... done\n", portid);
704 if (port_init(portid, mbuf_pool) != 0)
705 rte_exit(EXIT_FAILURE, "Cannot initialize port %u\n",
709 if (!nb_ports_available) {
710 rte_exit(EXIT_FAILURE,
711 "All available ports are disabled. Please set portmask.\n");
714 d = rte_distributor_create("PKT_DIST", rte_socket_id(),
715 rte_lcore_count() - 4,
718 rte_exit(EXIT_FAILURE, "Cannot create distributor\n");
721 * scheduler ring is read by the transmitter core, and written to
724 dist_tx_ring = rte_ring_create("Output_ring", SCHED_TX_RING_SZ,
725 rte_socket_id(), RING_F_SC_DEQ | RING_F_SP_ENQ);
726 if (dist_tx_ring == NULL)
727 rte_exit(EXIT_FAILURE, "Cannot create output ring\n");
729 rx_dist_ring = rte_ring_create("Input_ring", SCHED_RX_RING_SZ,
730 rte_socket_id(), RING_F_SC_DEQ | RING_F_SP_ENQ);
731 if (rx_dist_ring == NULL)
732 rte_exit(EXIT_FAILURE, "Cannot create output ring\n");
734 RTE_LCORE_FOREACH_SLAVE(lcore_id) {
735 if (worker_id == rte_lcore_count() - 3) {
736 printf("Starting distributor on lcore_id %d\n",
738 /* distributor core */
739 struct lcore_params *p =
740 rte_malloc(NULL, sizeof(*p), 0);
742 rte_panic("malloc failure\n");
743 *p = (struct lcore_params){worker_id, d,
744 rx_dist_ring, dist_tx_ring, mbuf_pool};
745 rte_eal_remote_launch(
746 (lcore_function_t *)lcore_distributor,
748 } else if (worker_id == rte_lcore_count() - 4) {
749 printf("Starting tx on worker_id %d, lcore_id %d\n",
750 worker_id, lcore_id);
752 rte_eal_remote_launch((lcore_function_t *)lcore_tx,
753 dist_tx_ring, lcore_id);
754 } else if (worker_id == rte_lcore_count() - 2) {
755 printf("Starting rx on worker_id %d, lcore_id %d\n",
756 worker_id, lcore_id);
758 struct lcore_params *p =
759 rte_malloc(NULL, sizeof(*p), 0);
761 rte_panic("malloc failure\n");
762 *p = (struct lcore_params){worker_id, d, rx_dist_ring,
763 dist_tx_ring, mbuf_pool};
764 rte_eal_remote_launch((lcore_function_t *)lcore_rx,
767 printf("Starting worker on worker_id %d, lcore_id %d\n",
768 worker_id, lcore_id);
769 struct lcore_params *p =
770 rte_malloc(NULL, sizeof(*p), 0);
772 rte_panic("malloc failure\n");
773 *p = (struct lcore_params){worker_id, d, rx_dist_ring,
774 dist_tx_ring, mbuf_pool};
776 rte_eal_remote_launch((lcore_function_t *)lcore_worker,
782 freq = rte_get_timer_hz();
783 t = rte_rdtsc() + freq;
784 while (!quit_signal_dist) {
785 if (t < rte_rdtsc()) {
787 t = rte_rdtsc() + freq;
792 RTE_LCORE_FOREACH_SLAVE(lcore_id) {
793 if (rte_eal_wait_lcore(lcore_id) < 0)