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igt/gem_gtt_speed: compare against WC mmaps

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2015-01-02 16:33:31 +05:30 committed by Daniel Vetter
parent e70c789909
commit 58865891ba
1 changed files with 62 additions and 1 deletions
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63
tests/gem_gtt_speed.c
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@ -206,6 +206,27 @@ int main(int argc, char **argv)
igt_info("Time to read %dk through a GTT map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
if (gem_mmap__has_wc(fd)) {
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
uint32_t *base = gem_mmap__wc(fd, handle, 0, size, PROT_READ | PROT_WRITE);
volatile uint32_t *ptr = base;
int x = 0;
for (i = 0; i < size/sizeof(*ptr); i++)
x += ptr[i];
/* force overtly clever gcc to actually compute x */
ptr[0] = x;
munmap(base, size);
}
gettimeofday(&end, NULL);
igt_info("Time to read %dk through a WC map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
}
/* mmap write */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
@ -221,6 +242,23 @@ int main(int argc, char **argv)
igt_info("Time to write %dk through a GTT map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
if (gem_mmap__has_wc(fd)) {
/* mmap write */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
uint32_t *base = gem_mmap__wc(fd, handle, 0, size, PROT_READ | PROT_WRITE);
volatile uint32_t *ptr = base;
for (i = 0; i < size/sizeof(*ptr); i++)
ptr[i] = i;
munmap(base, size);
}
gettimeofday(&end, NULL);
igt_info("Time to write %dk through a WC map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
}
/* mmap clear */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
@ -232,6 +270,19 @@ int main(int argc, char **argv)
igt_info("Time to clear %dk through a GTT map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
if (gem_mmap__has_wc(fd)) {
/* mmap clear */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
uint32_t *base = gem_mmap__wc(fd, handle, 0, size, PROT_READ | PROT_WRITE);
memset(base, 0, size);
munmap(base, size);
}
gettimeofday(&end, NULL);
igt_info("Time to clear %dk through a WC map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
}
gettimeofday(&start, NULL);{
uint32_t *base = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
for (loop = 0; loop < 1000; loop++)
@ -241,6 +292,17 @@ int main(int argc, char **argv)
igt_info("Time to clear %dk through a cached GTT map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
if (gem_mmap__has_wc(fd)) {
gettimeofday(&start, NULL);{
uint32_t *base = gem_mmap__wc(fd, handle, 0, size, PROT_READ | PROT_WRITE);
for (loop = 0; loop < 1000; loop++)
memset(base, 0, size);
munmap(base, size);
} gettimeofday(&end, NULL);
igt_info("Time to clear %dk through a cached WC map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
}
/* mmap read */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
@ -323,7 +385,6 @@ int main(int argc, char **argv)
size *= 4;
}
}
gem_close(fd, handle);