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gem_gtt_speed: Use a memset() to test streaming performance

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This make the reasonable assumption that the libc code for memset() can
saturate the memory bandwidth -- at any rate it should do better than
the copy.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-09-13 14:55:53 +01:00
parent efd68f9d64
commit f256ada3b6
1 changed files with 21 additions and 0 deletions
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21
tests/gem_gtt_speed.c
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@ -133,6 +133,16 @@ int main(int argc, char **argv)
gettimeofday(&end, NULL);
printf("Time to write %dk through a CPU map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
base = gem_mmap__cpu(fd, handle, size, PROT_READ | PROT_WRITE);
memset(base, 0, size);
munmap(base, size);
}
gettimeofday(&end, NULL);
printf("Time to clear %dk through a CPU map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
}
/* CPU pwrite */
@ -200,6 +210,17 @@ int main(int argc, char **argv)
printf("Time to write %dk through a GTT map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
/* mmap clear */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
uint32_t *base = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
memset(base, 0, size);
munmap(base, size);
}
gettimeofday(&end, NULL);
printf("Time to clear %dk through a GTT map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
/* mmap read */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {