summaryrefslogtreecommitdiffstats
path: root/app/test/test_memcpy_perf.c
blob: ff3aaaacad35223788f4b769e7f7fbc98442be14 (plain)
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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_random.h>
#include <rte_malloc.h>

#include <rte_memcpy.h>

#include "test.h"

/*
 * Set this to the maximum buffer size you want to test. If it is 0, then the
 * values in the buf_sizes[] array below will be used.
 */
#define TEST_VALUE_RANGE        0

/* List of buffer sizes to test */
#if TEST_VALUE_RANGE == 0
static size_t buf_sizes[] = {
	1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15, 16, 17, 31, 32, 33, 63, 64, 65, 127, 128,
	129, 191, 192, 193, 255, 256, 257, 319, 320, 321, 383, 384, 385, 447, 448,
	449, 511, 512, 513, 767, 768, 769, 1023, 1024, 1025, 1518, 1522, 1536, 1600,
	2048, 2560, 3072, 3584, 4096, 4608, 5120, 5632, 6144, 6656, 7168, 7680, 8192
};
/* MUST be as large as largest packet size above */
#define SMALL_BUFFER_SIZE       8192
#else /* TEST_VALUE_RANGE != 0 */
static size_t buf_sizes[TEST_VALUE_RANGE];
#define SMALL_BUFFER_SIZE       TEST_VALUE_RANGE
#endif /* TEST_VALUE_RANGE == 0 */


/*
 * Arrays of this size are used for measuring uncached memory accesses by
 * picking a random location within the buffer. Make this smaller if there are
 * memory allocation errors.
 */
#define LARGE_BUFFER_SIZE       (100 * 1024 * 1024)

/* How many times to run timing loop for performance tests */
#define TEST_ITERATIONS         1000000
#define TEST_BATCH_SIZE         100

/* Data is aligned on this many bytes (power of 2) */
#ifdef RTE_MACHINE_CPUFLAG_AVX512F
#define ALIGNMENT_UNIT          64
#elif defined RTE_MACHINE_CPUFLAG_AVX2
#define ALIGNMENT_UNIT          32
#else /* RTE_MACHINE_CPUFLAG */
#define ALIGNMENT_UNIT          16
#endif /* RTE_MACHINE_CPUFLAG */

/*
 * Pointers used in performance tests. The two large buffers are for uncached
 * access where random addresses within the buffer are used for each
 * memcpy. The two small buffers are for cached access.
 */
static uint8_t *large_buf_read, *large_buf_write;
static uint8_t *small_buf_read, *small_buf_write;

/* Initialise data buffers. */
static int
init_buffers(void)
{
	unsigned i;

	large_buf_read = rte_malloc("memcpy", LARGE_BUFFER_SIZE + ALIGNMENT_UNIT, ALIGNMENT_UNIT);
	if (large_buf_read == NULL)
		goto error_large_buf_read;

	large_buf_write = rte_malloc("memcpy", LARGE_BUFFER_SIZE + ALIGNMENT_UNIT, ALIGNMENT_UNIT);
	if (large_buf_write == NULL)
		goto error_large_buf_write;

	small_buf_read = rte_malloc("memcpy", SMALL_BUFFER_SIZE + ALIGNMENT_UNIT, ALIGNMENT_UNIT);
	if (small_buf_read == NULL)
		goto error_small_buf_read;

	small_buf_write = rte_malloc("memcpy", SMALL_BUFFER_SIZE + ALIGNMENT_UNIT, ALIGNMENT_UNIT);
	if (small_buf_write == NULL)
		goto error_small_buf_write;

	for (i = 0; i < LARGE_BUFFER_SIZE; i++)
		large_buf_read[i] = rte_rand();
	for (i = 0; i < SMALL_BUFFER_SIZE; i++)
		small_buf_read[i] = rte_rand();

	return 0;

error_small_buf_write:
	rte_free(small_buf_read);
error_small_buf_read:
	rte_free(large_buf_write);
error_large_buf_write:
	rte_free(large_buf_read);
error_large_buf_read:
	printf("ERROR: not enough memory\n");
	return -1;
}

/* Cleanup data buffers */
static void
free_buffers(void)
{
	rte_free(large_buf_read);
	rte_free(large_buf_write);
	rte_free(small_buf_read);
	rte_free(small_buf_write);
}

/*
 * Get a random offset into large array, with enough space needed to perform
 * max copy size. Offset is aligned, uoffset is used for unalignment setting.
 */
static inline size_t
get_rand_offset(size_t uoffset)
{
	return ((rte_rand() % (LARGE_BUFFER_SIZE - SMALL_BUFFER_SIZE)) &
			~(ALIGNMENT_UNIT - 1)) + uoffset;
}

/* Fill in source and destination addresses. */
static inline void
fill_addr_arrays(size_t *dst_addr, int is_dst_cached, size_t dst_uoffset,
				 size_t *src_addr, int is_src_cached, size_t src_uoffset)
{
	unsigned int i;

	for (i = 0; i < TEST_BATCH_SIZE; i++) {
		dst_addr[i] = (is_dst_cached) ? dst_uoffset : get_rand_offset(dst_uoffset);
		src_addr[i] = (is_src_cached) ? src_uoffset : get_rand_offset(src_uoffset);
	}
}

/*
 * WORKAROUND: For some reason the first test doing an uncached write
 * takes a very long time (~25 times longer than is expected). So we do
 * it once without timing.
 */
static void
do_uncached_write(uint8_t *dst, int is_dst_cached,
				  const uint8_t *src, int is_src_cached, size_t size)
{
	unsigned i, j;
	size_t dst_addrs[TEST_BATCH_SIZE], src_addrs[TEST_BATCH_SIZE];

	for (i = 0; i < (TEST_ITERATIONS / TEST_BATCH_SIZE); i++) {
		fill_addr_arrays(dst_addrs, is_dst_cached, 0,
						 src_addrs, is_src_cached, 0);
		for (j = 0; j < TEST_BATCH_SIZE; j++) {
			rte_memcpy(dst+dst_addrs[j], src+src_addrs[j], size);
		}
	}
}

/*
 * Run a single memcpy performance test. This is a macro to ensure that if
 * the "size" parameter is a constant it won't be converted to a variable.
 */
#define SINGLE_PERF_TEST(dst, is_dst_cached, dst_uoffset,                   \
                         src, is_src_cached, src_uoffset, size)             \
do {                                                                        \
    unsigned int iter, t;                                                   \
    size_t dst_addrs[TEST_BATCH_SIZE], src_addrs[TEST_BATCH_SIZE];          \
    uint64_t start_time, total_time = 0;                                    \
    uint64_t total_time2 = 0;                                               \
    for (iter = 0; iter < (TEST_ITERATIONS / TEST_BATCH_SIZE); iter++) {    \
        fill_addr_arrays(dst_addrs, is_dst_cached, dst_uoffset,             \
                         src_addrs, is_src_cached, src_uoffset);            \
        start_time = rte_rdtsc();                                           \
        for (t = 0; t < TEST_BATCH_SIZE; t++)                               \
            rte_memcpy(dst+dst_addrs[t], src+src_addrs[t], size);           \
        total_time += rte_rdtsc() - start_time;                             \
    }                                                                       \
    for (iter = 0; iter < (TEST_ITERATIONS / TEST_BATCH_SIZE); iter++) {    \
        fill_addr_arrays(dst_addrs, is_dst_cached, dst_uoffset,             \
                         src_addrs, is_src_cached, src_uoffset);            \
        start_time = rte_rdtsc();                                           \
        for (t = 0; t < TEST_BATCH_SIZE; t++)                               \
            memcpy(dst+dst_addrs[t], src+src_addrs[t], size);               \
        total_time2 += rte_rdtsc() - start_time;                            \
    }                                                                       \
    printf("%8.0f -",  (double)total_time /TEST_ITERATIONS);                \
    printf("%5.0f",  (double)total_time2 / TEST_ITERATIONS);                \
} while (0)

/* Run aligned memcpy tests for each cached/uncached permutation */
#define ALL_PERF_TESTS_FOR_SIZE(n)                                       \
do {                                                                     \
    if (__builtin_constant_p(n))                                         \
        printf("\nC%6u", (unsigned)n);                                   \
    else                                                                 \
        printf("\n%7u", (unsigned)n);                                    \
    SINGLE_PERF_TEST(small_buf_write, 1, 0, small_buf_read, 1, 0, n);    \
    SINGLE_PERF_TEST(large_buf_write, 0, 0, small_buf_read, 1, 0, n);    \
    SINGLE_PERF_TEST(small_buf_write, 1, 0, large_buf_read, 0, 0, n);    \
    SINGLE_PERF_TEST(large_buf_write, 0, 0, large_buf_read, 0, 0, n);    \
} while (0)

/* Run unaligned memcpy tests for each cached/uncached permutation */
#define ALL_PERF_TESTS_FOR_SIZE_UNALIGNED(n)                             \
do {                                                                     \
    if (__builtin_constant_p(n))                                         \
        printf("\nC%6u", (unsigned)n);                                   \
    else                                                                 \
        printf("\n%7u", (unsigned)n);                                    \
    SINGLE_PERF_TEST(small_buf_write, 1, 1, small_buf_read, 1, 5, n);    \
    SINGLE_PERF_TEST(large_buf_write, 0, 1, small_buf_read, 1, 5, n);    \
    SINGLE_PERF_TEST(small_buf_write, 1, 1, large_buf_read, 0, 5, n);    \
    SINGLE_PERF_TEST(large_buf_write, 0, 1, large_buf_read, 0, 5, n);    \
} while (0)

/* Run memcpy tests for constant length */
#define ALL_PERF_TEST_FOR_CONSTANT                                      \
do {                                                                    \
    TEST_CONSTANT(6U); TEST_CONSTANT(64U); TEST_CONSTANT(128U);         \
    TEST_CONSTANT(192U); TEST_CONSTANT(256U); TEST_CONSTANT(512U);      \
    TEST_CONSTANT(768U); TEST_CONSTANT(1024U); TEST_CONSTANT(1536U);    \
} while (0)

/* Run all memcpy tests for aligned constant cases */
static inline void
perf_test_constant_aligned(void)
{
#define TEST_CONSTANT ALL_PERF_TESTS_FOR_SIZE
	ALL_PERF_TEST_FOR_CONSTANT;
#undef TEST_CONSTANT
}

/* Run all memcpy tests for unaligned constant cases */
static inline void
perf_test_constant_unaligned(void)
{
#define TEST_CONSTANT ALL_PERF_TESTS_FOR_SIZE_UNALIGNED
	ALL_PERF_TEST_FOR_CONSTANT;
#undef TEST_CONSTANT
}

/* Run all memcpy tests for aligned variable cases */
static inline void
perf_test_variable_aligned(void)
{
	unsigned n = sizeof(buf_sizes) / sizeof(buf_sizes[0]);
	unsigned i;
	for (i = 0; i < n; i++) {
		ALL_PERF_TESTS_FOR_SIZE((size_t)buf_sizes[i]);
	}
}

/* Run all memcpy tests for unaligned variable cases */
static inline void
perf_test_variable_unaligned(void)
{
	unsigned n = sizeof(buf_sizes) / sizeof(buf_sizes[0]);
	unsigned i;
	for (i = 0; i < n; i++) {
		ALL_PERF_TESTS_FOR_SIZE_UNALIGNED((size_t)buf_sizes[i]);
	}
}

/* Run all memcpy tests */
static int
perf_test(void)
{
	int ret;

	ret = init_buffers();
	if (ret != 0)
		return ret;

#if TEST_VALUE_RANGE != 0
	/* Set up buf_sizes array, if required */
	unsigned i;
	for (i = 0; i < TEST_VALUE_RANGE; i++)
		buf_sizes[i] = i;
#endif

	/* See function comment */
	do_uncached_write(large_buf_write, 0, small_buf_read, 1, SMALL_BUFFER_SIZE);

	printf("\n** rte_memcpy() - memcpy perf. tests (C = compile-time constant) **\n"
		   "======= ============== ============== ============== ==============\n"
		   "   Size Cache to cache   Cache to mem   Mem to cache     Mem to mem\n"
		   "(bytes)        (ticks)        (ticks)        (ticks)        (ticks)\n"
		   "------- -------------- -------------- -------------- --------------");

	printf("\n========================== %2dB aligned ============================", ALIGNMENT_UNIT);
	/* Do aligned tests where size is a variable */
	perf_test_variable_aligned();
	printf("\n------- -------------- -------------- -------------- --------------");
	/* Do aligned tests where size is a compile-time constant */
	perf_test_constant_aligned();
	printf("\n=========================== Unaligned =============================");
	/* Do unaligned tests where size is a variable */
	perf_test_variable_unaligned();
	printf("\n------- -------------- -------------- -------------- --------------");
	/* Do unaligned tests where size is a compile-time constant */
	perf_test_constant_unaligned();
	printf("\n======= ============== ============== ============== ==============\n\n");

	free_buffers();

	return 0;
}

static int
test_memcpy_perf(void)
{
	int ret;

	ret = perf_test();
	if (ret != 0)
		return -1;
	return 0;
}

REGISTER_TEST_COMMAND(memcpy_perf_autotest, test_memcpy_perf);