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40 #include <rte_common.h>
41 #include <cmdline_parse.h>
42 #include <rte_cycles.h>
43 #include <rte_random.h>
44 #include <rte_malloc.h>
46 #include <rte_memcpy.h>
51 * Set this to the maximum buffer size you want to test. If it is 0, then the
52 * values in the buf_sizes[] array below will be used.
54 #define TEST_VALUE_RANGE 0
56 /* List of buffer sizes to test */
57 #if TEST_VALUE_RANGE == 0
58 static size_t buf_sizes[] = {
59 0, 1, 7, 8, 9, 15, 16, 17, 31, 32, 33, 63, 64, 65, 127, 128, 129, 255,
60 256, 257, 320, 384, 511, 512, 513, 1023, 1024, 1025, 1518, 1522, 1600,
61 2048, 3072, 4096, 5120, 6144, 7168, 8192
63 /* MUST be as large as largest packet size above */
64 #define SMALL_BUFFER_SIZE 8192
65 #else /* TEST_VALUE_RANGE != 0 */
66 static size_t buf_sizes[TEST_VALUE_RANGE];
67 #define SMALL_BUFFER_SIZE TEST_VALUE_RANGE
68 #endif /* TEST_VALUE_RANGE == 0 */
72 * Arrays of this size are used for measuring uncached memory accesses by
73 * picking a random location within the buffer. Make this smaller if there are
74 * memory allocation errors.
76 #define LARGE_BUFFER_SIZE (100 * 1024 * 1024)
78 /* How many times to run timing loop for performance tests */
79 #define TEST_ITERATIONS 1000000
80 #define TEST_BATCH_SIZE 100
82 /* Data is aligned on this many bytes (power of 2) */
83 #define ALIGNMENT_UNIT 16
86 * Pointers used in performance tests. The two large buffers are for uncached
87 * access where random addresses within the buffer are used for each
88 * memcpy. The two small buffers are for cached access.
90 static uint8_t *large_buf_read, *large_buf_write;
91 static uint8_t *small_buf_read, *small_buf_write;
93 /* Initialise data buffers. */
99 large_buf_read = rte_malloc("memcpy", LARGE_BUFFER_SIZE, ALIGNMENT_UNIT);
100 if (large_buf_read == NULL)
101 goto error_large_buf_read;
103 large_buf_write = rte_malloc("memcpy", LARGE_BUFFER_SIZE, ALIGNMENT_UNIT);
104 if (large_buf_write == NULL)
105 goto error_large_buf_write;
107 small_buf_read = rte_malloc("memcpy", SMALL_BUFFER_SIZE, ALIGNMENT_UNIT);
108 if (small_buf_read == NULL)
109 goto error_small_buf_read;
111 small_buf_write = rte_malloc("memcpy", SMALL_BUFFER_SIZE, ALIGNMENT_UNIT);
112 if (small_buf_write == NULL)
113 goto error_small_buf_write;
115 for (i = 0; i < LARGE_BUFFER_SIZE; i++)
116 large_buf_read[i] = rte_rand();
117 for (i = 0; i < SMALL_BUFFER_SIZE; i++)
118 small_buf_read[i] = rte_rand();
122 error_small_buf_write:
123 rte_free(small_buf_read);
124 error_small_buf_read:
125 rte_free(large_buf_write);
126 error_large_buf_write:
127 rte_free(large_buf_read);
128 error_large_buf_read:
129 printf("ERROR: not enough memory\n");
133 /* Cleanup data buffers */
137 rte_free(large_buf_read);
138 rte_free(large_buf_write);
139 rte_free(small_buf_read);
140 rte_free(small_buf_write);
144 * Get a random offset into large array, with enough space needed to perform
145 * max copy size. Offset is aligned.
148 get_rand_offset(void)
150 return ((rte_rand() % (LARGE_BUFFER_SIZE - SMALL_BUFFER_SIZE)) &
151 ~(ALIGNMENT_UNIT - 1));
154 /* Fill in source and destination addresses. */
156 fill_addr_arrays(size_t *dst_addr, int is_dst_cached,
157 size_t *src_addr, int is_src_cached)
161 for (i = 0; i < TEST_BATCH_SIZE; i++) {
162 dst_addr[i] = (is_dst_cached) ? 0 : get_rand_offset();
163 src_addr[i] = (is_src_cached) ? 0 : get_rand_offset();
168 * WORKAROUND: For some reason the first test doing an uncached write
169 * takes a very long time (~25 times longer than is expected). So we do
170 * it once without timing.
173 do_uncached_write(uint8_t *dst, int is_dst_cached,
174 const uint8_t *src, int is_src_cached, size_t size)
177 size_t dst_addrs[TEST_BATCH_SIZE], src_addrs[TEST_BATCH_SIZE];
179 for (i = 0; i < (TEST_ITERATIONS / TEST_BATCH_SIZE); i++) {
180 fill_addr_arrays(dst_addrs, is_dst_cached,
181 src_addrs, is_src_cached);
182 for (j = 0; j < TEST_BATCH_SIZE; j++)
183 rte_memcpy(dst+dst_addrs[j], src+src_addrs[j], size);
188 * Run a single memcpy performance test. This is a macro to ensure that if
189 * the "size" parameter is a constant it won't be converted to a variable.
191 #define SINGLE_PERF_TEST(dst, is_dst_cached, src, is_src_cached, size) do { \
192 unsigned int iter, t; \
193 size_t dst_addrs[TEST_BATCH_SIZE], src_addrs[TEST_BATCH_SIZE]; \
194 uint64_t start_time, total_time = 0; \
195 uint64_t total_time2 = 0; \
196 for (iter = 0; iter < (TEST_ITERATIONS / TEST_BATCH_SIZE); iter++) { \
197 fill_addr_arrays(dst_addrs, is_dst_cached, \
198 src_addrs, is_src_cached); \
199 start_time = rte_rdtsc(); \
200 for (t = 0; t < TEST_BATCH_SIZE; t++) \
201 rte_memcpy(dst+dst_addrs[t], src+src_addrs[t], size); \
202 total_time += rte_rdtsc() - start_time; \
204 for (iter = 0; iter < (TEST_ITERATIONS / TEST_BATCH_SIZE); iter++) { \
205 fill_addr_arrays(dst_addrs, is_dst_cached, \
206 src_addrs, is_src_cached); \
207 start_time = rte_rdtsc(); \
208 for (t = 0; t < TEST_BATCH_SIZE; t++) \
209 memcpy(dst+dst_addrs[t], src+src_addrs[t], size); \
210 total_time2 += rte_rdtsc() - start_time; \
212 printf("%8.0f -", (double)total_time /TEST_ITERATIONS); \
213 printf("%5.0f", (double)total_time2 / TEST_ITERATIONS); \
216 /* Run memcpy() tests for each cached/uncached permutation. */
217 #define ALL_PERF_TESTS_FOR_SIZE(n) do { \
218 if (__builtin_constant_p(n)) \
219 printf("\nC%6u", (unsigned)n); \
221 printf("\n%7u", (unsigned)n); \
222 SINGLE_PERF_TEST(small_buf_write, 1, small_buf_read, 1, n); \
223 SINGLE_PERF_TEST(large_buf_write, 0, small_buf_read, 1, n); \
224 SINGLE_PERF_TEST(small_buf_write, 1, large_buf_read, 0, n); \
225 SINGLE_PERF_TEST(large_buf_write, 0, large_buf_read, 0, n); \
229 * Run performance tests for a number of different sizes and cached/uncached
235 const unsigned num_buf_sizes = sizeof(buf_sizes) / sizeof(buf_sizes[0]);
239 ret = init_buffers();
243 #if TEST_VALUE_RANGE != 0
244 /* Setup buf_sizes array, if required */
245 for (i = 0; i < TEST_VALUE_RANGE; i++)
249 /* See function comment */
250 do_uncached_write(large_buf_write, 0, small_buf_read, 1, SMALL_BUFFER_SIZE);
252 printf("\n** rte_memcpy() - memcpy perf. tests (C = compile-time constant) **\n"
253 "======= ============== ============== ============== ==============\n"
254 " Size Cache to cache Cache to mem Mem to cache Mem to mem\n"
255 "(bytes) (ticks) (ticks) (ticks) (ticks)\n"
256 "------- -------------- -------------- -------------- --------------");
258 /* Do tests where size is a variable */
259 for (i = 0; i < num_buf_sizes; i++) {
260 ALL_PERF_TESTS_FOR_SIZE((size_t)buf_sizes[i]);
262 printf("\n------- -------------- -------------- -------------- --------------");
263 /* Do tests where size is a compile-time constant */
264 ALL_PERF_TESTS_FOR_SIZE(63U);
265 ALL_PERF_TESTS_FOR_SIZE(64U);
266 ALL_PERF_TESTS_FOR_SIZE(65U);
267 ALL_PERF_TESTS_FOR_SIZE(255U);
268 ALL_PERF_TESTS_FOR_SIZE(256U);
269 ALL_PERF_TESTS_FOR_SIZE(257U);
270 ALL_PERF_TESTS_FOR_SIZE(1023U);
271 ALL_PERF_TESTS_FOR_SIZE(1024U);
272 ALL_PERF_TESTS_FOR_SIZE(1025U);
273 ALL_PERF_TESTS_FOR_SIZE(1518U);
275 printf("\n======= ============== ============== ============== ==============\n\n");
284 test_memcpy_perf(void)