1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/* 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 */
if (rte_eth_dev_stop(ring_ethdev_port) != 0)
return -1;
rte_eth_dev_get_name_by_port(ring_ethdev_port, name);
rte_vdev_uninit(name);
rte_ring_free(r);
return 0;
}
REGISTER_PERF_TEST(ring_pmd_perf_autotest, test_ring_pmd_perf);
|
