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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2015 Intel Corporation
*/
#include <stdio.h>
#include <inttypes.h>
#include <rte_ring.h>
#include <rte_cycles.h>
#include <rte_launch.h>
#include <rte_ethdev.h>
#include <rte_eth_ring.h>
#include <rte_bus_vdev.h>
#include "test.h"
#define RING_NAME "RING_PERF"
#define RING_SIZE 4096
#define MAX_BURST 32
/*
* the sizes to enqueue and dequeue in testing
* (marked volatile so they won't be seen as compile-time constants)
*/
static const volatile unsigned bulk_sizes[] = { 1, 8, 32 };
/* The ring structure used for tests */
static struct rte_ring *r;
static uint16_t ring_ethdev_port;
/* Get cycle counts for dequeuing from an empty ring. Should be 2 or 3 cycles */
static void
test_empty_dequeue(void)
{
const unsigned iter_shift = 26;
const unsigned iterations = 1 << iter_shift;
unsigned i = 0;
void *burst[MAX_BURST];
const uint64_t sc_start = rte_rdtsc();
for (i = 0; i < iterations; i++)
rte_ring_sc_dequeue_bulk(r, burst, bulk_sizes[0], NULL);
const uint64_t sc_end = rte_rdtsc();
const uint64_t eth_start = rte_rdtsc();
for (i = 0; i < iterations; i++)
rte_eth_rx_burst(ring_ethdev_port, 0, (void *)burst,
bulk_sizes[0]);
const uint64_t eth_end = rte_rdtsc();
printf("Ring empty dequeue : %.1F\n",
(double)(sc_end - sc_start) / iterations);
printf("Ethdev empty dequeue: %.1F\n",
(double)(eth_end - eth_start) / iterations);
}
/*
* Test function that determines how long an enqueue + dequeue of a single item
* takes on a single lcore. Result is for comparison with the bulk enq+deq.
*/
static void
test_single_enqueue_dequeue(void)
{
const unsigned iter_shift = 24;
const unsigned iterations = 1 << iter_shift;
unsigned i = 0;
void *burst = NULL;
struct rte_mbuf *mburst[1] = { NULL };
const uint64_t sc_start = rte_rdtsc_precise();
rte_compiler_barrier();
for (i = 0; i < iterations; i++) {
rte_ring_enqueue_bulk(r, &burst, 1, NULL);
rte_ring_dequeue_bulk(r, &burst, 1, NULL);
}
const uint64_t sc_end = rte_rdtsc_precise();
rte_compiler_barrier();
const uint64_t eth_start = rte_rdtsc_precise();
rte_compiler_barrier();
for (i = 0; i < iterations; i++) {
rte_eth_tx_burst(ring_ethdev_port, 0, mburst, 1);
rte_eth_rx_burst(ring_ethdev_port, 0, mburst, 1);
}
const uint64_t eth_end = rte_rdtsc_precise();
rte_compiler_barrier();
printf("Ring single enq/dequeue : %"PRIu64"\n",
(sc_end-sc_start) >> iter_shift);
printf("Ethdev single enq/dequeue: %"PRIu64"\n",
(eth_end-eth_start) >> iter_shift);
}
/* Times enqueue and dequeue on a single lcore */
static void
test_bulk_enqueue_dequeue(void)
{
const unsigned iter_shift = 23;
const unsigned iterations = 1 << iter_shift;
unsigned sz, i = 0;
struct rte_mbuf *burst[MAX_BURST] = {0};
for (sz = 0; sz < RTE_DIM(bulk_sizes); sz++) {
const uint64_t sc_start = rte_rdtsc();
for (i = 0; i < iterations; i++) {
rte_ring_sp_enqueue_bulk(r, (void *)burst,
bulk_sizes[sz], NULL);
rte_ring_sc_dequeue_bulk(r, (void *)burst,
bulk_sizes[sz], NULL);
}
const uint64_t sc_end = rte_rdtsc();
const uint64_t eth_start = rte_rdtsc_precise();
rte_compiler_barrier();
for (i = 0; i < iterations; i++) {
rte_eth_tx_burst(ring_ethdev_port, 0, burst, bulk_sizes[sz]);
rte_eth_rx_burst(ring_ethdev_port, 0, burst, bulk_sizes[sz]);
}
const uint64_t eth_end = rte_rdtsc_precise();
rte_compiler_barrier();
double sc_avg = ((double)(sc_end-sc_start) /
(iterations * bulk_sizes[sz]));
double eth_avg = ((double)(eth_end-eth_start) /
(iterations * bulk_sizes[sz]));
printf("ring bulk enq/deq (size: %u) : %.1F\n", bulk_sizes[sz],
sc_avg);
printf("ethdev bulk enq/deq (size:%u): %.1F\n", bulk_sizes[sz],
eth_avg);
printf("\n");
}
}
static int
test_ring_pmd_perf(void)
{
char name[RTE_ETH_NAME_MAX_LEN];
r = rte_ring_create(RING_NAME, RING_SIZE, rte_socket_id(),
RING_F_SP_ENQ|RING_F_SC_DEQ);
if (r == NULL && (r = rte_ring_lookup(RING_NAME)) == NULL)
return -1;
ring_ethdev_port = rte_eth_from_ring(r);
printf("\n### Testing const single element enq/deq ###\n");
test_single_enqueue_dequeue();
printf("\n### Testing empty dequeue ###\n");
test_empty_dequeue();
printf("\n### Testing using a single lcore ###\n");
test_bulk_enqueue_dequeue();
/* release port and ring resources */
rte_eth_dev_stop(ring_ethdev_port);
rte_eth_dev_get_name_by_port(ring_ethdev_port, name);
rte_vdev_uninit(name);
rte_ring_free(r);
return 0;
}
REGISTER_TEST_COMMAND(ring_pmd_perf_autotest, test_ring_pmd_perf);
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