429 lines
13 KiB
C
429 lines
13 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <rte_common.h>
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#include <cmdline_parse.h>
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#include <rte_cycles.h>
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#include <rte_random.h>
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#include <rte_malloc.h>
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#include <rte_memcpy.h>
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#include "test.h"
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/*
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* Set this to the maximum buffer size you want to test. If it is 0, then the
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* values in the buf_sizes[] array below will be used.
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*/
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#define TEST_VALUE_RANGE 0
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/* List of buffer sizes to test */
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#if TEST_VALUE_RANGE == 0
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static size_t buf_sizes[] = {
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0, 1, 7, 8, 9, 15, 16, 17, 31, 32, 33, 63, 64, 65, 127, 128, 129, 255,
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256, 257, 320, 384, 511, 512, 513, 1023, 1024, 1025, 1518, 1522, 1600,
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2048, 3072, 4096, 5120, 6144, 7168, 8192
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};
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/* MUST be as large as largest packet size above */
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#define SMALL_BUFFER_SIZE 8192
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#else /* TEST_VALUE_RANGE != 0 */
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static size_t buf_sizes[TEST_VALUE_RANGE];
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#define SMALL_BUFFER_SIZE TEST_VALUE_RANGE
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#endif /* TEST_VALUE_RANGE == 0 */
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/*
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* Arrays of this size are used for measuring uncached memory accesses by
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* picking a random location within the buffer. Make this smaller if there are
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* memory allocation errors.
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*/
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#define LARGE_BUFFER_SIZE (100 * 1024 * 1024)
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/* How many times to run timing loop for performance tests */
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#define TEST_ITERATIONS 1000000
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#define TEST_BATCH_SIZE 100
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/* Data is aligned on this many bytes (power of 2) */
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#define ALIGNMENT_UNIT 16
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/*
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* Pointers used in performance tests. The two large buffers are for uncached
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* access where random addresses within the buffer are used for each
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* memcpy. The two small buffers are for cached access.
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*/
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static uint8_t *large_buf_read, *large_buf_write,
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*small_buf_read, *small_buf_write;
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/* Initialise data buffers. */
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static int
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init_buffers(void)
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{
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unsigned i;
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large_buf_read = rte_malloc("memcpy", LARGE_BUFFER_SIZE, ALIGNMENT_UNIT);
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if (large_buf_read == NULL)
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goto error_large_buf_read;
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large_buf_write = rte_malloc("memcpy", LARGE_BUFFER_SIZE, ALIGNMENT_UNIT);
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if (large_buf_write == NULL)
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goto error_large_buf_write;
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small_buf_read = rte_malloc("memcpy", SMALL_BUFFER_SIZE, ALIGNMENT_UNIT);
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if (small_buf_read == NULL)
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goto error_small_buf_read;
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small_buf_write = rte_malloc("memcpy", SMALL_BUFFER_SIZE, ALIGNMENT_UNIT);
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if (small_buf_write == NULL)
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goto error_small_buf_write;
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for (i = 0; i < LARGE_BUFFER_SIZE; i++)
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large_buf_read[i] = rte_rand();
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for (i = 0; i < SMALL_BUFFER_SIZE; i++)
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small_buf_read[i] = rte_rand();
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return 0;
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error_small_buf_write:
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rte_free(small_buf_read);
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error_small_buf_read:
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rte_free(large_buf_write);
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error_large_buf_write:
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rte_free(large_buf_read);
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error_large_buf_read:
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printf("ERROR: not enough memory");
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return -1;
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}
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/* Cleanup data buffers */
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static void
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free_buffers(void)
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{
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rte_free(large_buf_read);
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rte_free(large_buf_write);
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rte_free(small_buf_read);
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rte_free(small_buf_write);
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}
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/*
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* Get a random offset into large array, with enough space needed to perform
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* max copy size. Offset is aligned.
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*/
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static inline size_t
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get_rand_offset(void)
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{
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return ((rte_rand() % (LARGE_BUFFER_SIZE - SMALL_BUFFER_SIZE)) &
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~(ALIGNMENT_UNIT - 1));
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}
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/* Fill in source and destination addresses. */
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static inline void
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fill_addr_arrays(size_t *dst_addr, int is_dst_cached,
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size_t *src_addr, int is_src_cached)
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{
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unsigned int i;
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for (i = 0; i < TEST_BATCH_SIZE; i++) {
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dst_addr[i] = (is_dst_cached) ? 0 : get_rand_offset();
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src_addr[i] = (is_src_cached) ? 0 : get_rand_offset();
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}
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}
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/* Integer division with round to nearest */
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static inline uint64_t
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div_round(uint64_t dividend, uint64_t divisor)
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{
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return ((2 * dividend) + divisor) / (2 * divisor);
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}
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/*
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* WORKAROUND: For some reason the first test doing an uncached write
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* takes a very long time (~25 times longer than is expected). So we do
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* it once without timing.
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*/
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static void
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do_uncached_write(uint8_t *dst, int is_dst_cached,
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const uint8_t *src, int is_src_cached, size_t size)
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{
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unsigned i, j;
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size_t dst_addrs[TEST_BATCH_SIZE], src_addrs[TEST_BATCH_SIZE];
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for (i = 0; i < (TEST_ITERATIONS / TEST_BATCH_SIZE); i++) {
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fill_addr_arrays(dst_addrs, is_dst_cached,
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src_addrs, is_src_cached);
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for (j = 0; j < TEST_BATCH_SIZE; j++)
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rte_memcpy(dst+dst_addrs[j], src+src_addrs[j], size);
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}
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}
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/*
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* Run a single memcpy performance test. This is a macro to ensure that if
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* the "size" parameter is a constant it won't be converted to a variable.
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*/
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#define SINGLE_PERF_TEST(dst, is_dst_cached, src, is_src_cached, size) do { \
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unsigned int iter, t; \
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size_t dst_addrs[TEST_BATCH_SIZE], src_addrs[TEST_BATCH_SIZE]; \
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uint64_t start_time, total_time = 0; \
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uint64_t total_time2 = 0; \
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for (iter = 0; iter < (TEST_ITERATIONS / TEST_BATCH_SIZE); iter++) { \
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fill_addr_arrays(dst_addrs, is_dst_cached, \
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src_addrs, is_src_cached); \
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start_time = rte_rdtsc(); \
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for (t = 0; t < TEST_BATCH_SIZE; t++) \
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rte_memcpy(dst+dst_addrs[t], src+src_addrs[t], size); \
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total_time += rte_rdtsc() - start_time; \
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} \
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for (iter = 0; iter < (TEST_ITERATIONS / TEST_BATCH_SIZE); iter++) { \
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fill_addr_arrays(dst_addrs, is_dst_cached, \
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src_addrs, is_src_cached); \
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start_time = rte_rdtsc(); \
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for (t = 0; t < TEST_BATCH_SIZE; t++) \
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memcpy(dst+dst_addrs[t], src+src_addrs[t], size); \
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total_time2 += rte_rdtsc() - start_time; \
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} \
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printf("%9u/", (unsigned)div_round(total_time, TEST_ITERATIONS)); \
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printf("%4u", (unsigned)div_round(total_time2, TEST_ITERATIONS)); \
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} while (0)
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/* Run memcpy() tests for each cached/uncached permutation. */
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#define ALL_PERF_TESTS_FOR_SIZE(n) do { \
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if (__builtin_constant_p(n)) \
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printf("\nC%6u ", (unsigned)n); \
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else \
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printf("\n%7u ", (unsigned)n); \
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SINGLE_PERF_TEST(small_buf_write, 1, small_buf_read, 1, n); \
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SINGLE_PERF_TEST(large_buf_write, 0, small_buf_read, 1, n); \
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SINGLE_PERF_TEST(small_buf_write, 1, large_buf_read, 0, n); \
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SINGLE_PERF_TEST(large_buf_write, 0, large_buf_read, 0, n); \
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} while (0)
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/*
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* Run performance tests for a number of different sizes and cached/uncached
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* permutations.
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*/
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static int
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perf_test(void)
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{
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const unsigned num_buf_sizes = sizeof(buf_sizes) / sizeof(buf_sizes[0]);
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unsigned i;
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int ret;
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ret = init_buffers();
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if (ret != 0)
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return ret;
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#if TEST_VALUE_RANGE != 0
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/* Setup buf_sizes array, if required */
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for (i = 0; i < TEST_VALUE_RANGE; i++)
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buf_sizes[i] = i;
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#endif
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/* See function comment */
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do_uncached_write(large_buf_write, 0, small_buf_read, 1, SMALL_BUFFER_SIZE);
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printf("\n** rte_memcpy()/memcpy performance tests **\n"
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"======= ============== ============== ============== ==============\n"
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" Size Cache to cache Cache to mem Mem to cache Mem to mem\n"
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"(bytes) (ticks) (ticks) (ticks) (ticks)\n"
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"------- -------------- -------------- -------------- --------------");
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/* Do tests where size is a variable */
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for (i = 0; i < num_buf_sizes; i++) {
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ALL_PERF_TESTS_FOR_SIZE((size_t)buf_sizes[i]);
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}
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#ifdef RTE_MEMCPY_BUILTIN_CONSTANT_P
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/* Do tests where size is a compile-time constant */
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ALL_PERF_TESTS_FOR_SIZE(63U);
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ALL_PERF_TESTS_FOR_SIZE(64U);
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ALL_PERF_TESTS_FOR_SIZE(65U);
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ALL_PERF_TESTS_FOR_SIZE(255U);
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ALL_PERF_TESTS_FOR_SIZE(256U);
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ALL_PERF_TESTS_FOR_SIZE(257U);
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ALL_PERF_TESTS_FOR_SIZE(1023U);
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ALL_PERF_TESTS_FOR_SIZE(1024U);
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ALL_PERF_TESTS_FOR_SIZE(1025U);
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ALL_PERF_TESTS_FOR_SIZE(1518U);
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#endif
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printf("\n======= ============== ============== ============== ==============\n\n");
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free_buffers();
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return 0;
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}
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/* Structure with base memcpy func pointer, and number of bytes it copies */
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struct base_memcpy_func {
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void (*func)(uint8_t *dst, const uint8_t *src);
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unsigned size;
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};
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/* To create base_memcpy_func structure entries */
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#define BASE_FUNC(n) {rte_mov##n, n}
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/* Max number of bytes that can be copies with a "base" memcpy functions */
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#define MAX_BASE_FUNC_SIZE 256
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/*
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* Test the "base" memcpy functions, that a copy fixed number of bytes.
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*/
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static int
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base_func_test(void)
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{
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const struct base_memcpy_func base_memcpy_funcs[6] = {
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BASE_FUNC(16),
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BASE_FUNC(32),
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BASE_FUNC(48),
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BASE_FUNC(64),
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BASE_FUNC(128),
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BASE_FUNC(256),
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};
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unsigned i, j;
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unsigned num_funcs = sizeof(base_memcpy_funcs) / sizeof(base_memcpy_funcs[0]);
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uint8_t dst[MAX_BASE_FUNC_SIZE];
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uint8_t src[MAX_BASE_FUNC_SIZE];
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for (i = 0; i < num_funcs; i++) {
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unsigned size = base_memcpy_funcs[i].size;
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for (j = 0; j < size; j++) {
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dst[j] = 0;
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src[j] = (uint8_t) rte_rand();
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}
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base_memcpy_funcs[i].func(dst, src);
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for (j = 0; j < size; j++)
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if (dst[j] != src[j])
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return -1;
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}
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return 0;
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}
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/*
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* Create two buffers, and initialise one with random values. These are copied
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* to the second buffer and then compared to see if the copy was successful.
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* The bytes outside the copied area are also checked to make sure they were not
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* changed.
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*/
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static int
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test_single_memcpy(unsigned int off_src, unsigned int off_dst, size_t size)
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{
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unsigned int i;
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uint8_t dest[SMALL_BUFFER_SIZE + ALIGNMENT_UNIT];
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uint8_t src[SMALL_BUFFER_SIZE + ALIGNMENT_UNIT];
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/* Setup buffers */
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for (i = 0; i < SMALL_BUFFER_SIZE + ALIGNMENT_UNIT; i++) {
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dest[i] = 0;
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src[i] = (uint8_t) rte_rand();
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}
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/* Do the copy */
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rte_memcpy(dest + off_dst, src + off_src, size);
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/* Check nothing before offset is affected */
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for (i = 0; i < off_dst; i++) {
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if (dest[i] != 0) {
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printf("rte_memcpy() failed for %u bytes (offsets=%u,%u): "
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"[modified before start of dst].\n",
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(unsigned)size, off_src, off_dst);
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return -1;
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}
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}
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/* Check everything was copied */
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for (i = 0; i < size; i++) {
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if (dest[i + off_dst] != src[i + off_src]) {
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printf("rte_memcpy() failed for %u bytes (offsets=%u,%u): "
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"[didn't copy byte %u].\n",
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(unsigned)size, off_src, off_dst, i);
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return -1;
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}
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}
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/* Check nothing after copy was affected */
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for (i = size; i < SMALL_BUFFER_SIZE; i++) {
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if (dest[i + off_dst] != 0) {
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printf("rte_memcpy() failed for %u bytes (offsets=%u,%u): "
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"[copied too many].\n",
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(unsigned)size, off_src, off_dst);
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return -1;
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}
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}
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return 0;
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}
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/*
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* Check functionality for various buffer sizes and data offsets/alignments.
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*/
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static int
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func_test(void)
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{
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unsigned int off_src, off_dst, i;
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unsigned int num_buf_sizes = sizeof(buf_sizes) / sizeof(buf_sizes[0]);
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int ret;
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for (off_src = 0; off_src < ALIGNMENT_UNIT; off_src++) {
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for (off_dst = 0; off_dst < ALIGNMENT_UNIT; off_dst++) {
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for (i = 0; i < num_buf_sizes; i++) {
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ret = test_single_memcpy(off_src, off_dst,
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buf_sizes[i]);
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if (ret != 0)
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return -1;
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}
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}
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}
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return 0;
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}
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int
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test_memcpy(void)
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{
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int ret;
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ret = func_test();
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if (ret != 0)
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return -1;
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ret = base_func_test();
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if (ret != 0)
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return -1;
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ret = perf_test();
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if (ret != 0)
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return -1;
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return 0;
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}
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