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test/gem_gtt_speed: Add a baseline test for the performance of a CPU mmap

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When looking at the pwrite/pread/wc performance, it is useful to judge
that against the performance of an ordinary CPU mmap.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson
2012-06-04 17:29:20 +01:00
parent b558877f6e
commit 77586dcdf7
4 changed files with 94 additions and 21 deletions
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tests/gem_gtt_speed.c
+64 -8
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@@ -83,6 +83,58 @@ int main(int argc, char **argv)
}
if (tiling == I915_TILING_NONE) {
gem_set_domain(fd, handle,
I915_GEM_DOMAIN_CPU,
I915_GEM_DOMAIN_CPU);
{
uint32_t *base = gem_mmap__cpu(fd, handle, 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);
/* mmap read */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
base = gem_mmap__cpu(fd, handle, size, PROT_READ | PROT_WRITE);
ptr = base;
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);
printf("Time to read %dk through a CPU map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
/* mmap write */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
base = gem_mmap__cpu(fd, handle, size, PROT_READ | PROT_WRITE);
ptr = base;
for (i = 0; i < size/sizeof(*ptr); i++)
ptr[i] = i;
munmap(base, size);
}
gettimeofday(&end, NULL);
printf("Time to write %dk through a CPU map: %7.3fµs\n",
size/1024, elapsed(&start, &end, loop));
}
/* CPU pwrite */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++)
@@ -102,7 +154,8 @@ int main(int argc, char **argv)
/* prefault into gtt */
{
uint32_t *ptr = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
uint32_t *base = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
volatile uint32_t *ptr = base;
int x = 0;
for (i = 0; i < size/sizeof(*ptr); i++)
@@ -111,12 +164,13 @@ int main(int argc, char **argv)
/* force overtly clever gcc to actually compute x */
ptr[0] = x;
munmap(ptr, size);
munmap(base, size);
}
/* mmap read */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
uint32_t *ptr = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
uint32_t *base = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
volatile uint32_t *ptr = base;
int x = 0;
for (i = 0; i < size/sizeof(*ptr); i++)
@@ -125,7 +179,7 @@ int main(int argc, char **argv)
/* force overtly clever gcc to actually compute x */
ptr[0] = x;
munmap(ptr, size);
munmap(base, size);
}
gettimeofday(&end, NULL);
printf("Time to read %dk through a GTT map: %7.3fµs\n",
@@ -134,12 +188,13 @@ int main(int argc, char **argv)
/* mmap write */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
uint32_t *ptr = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
uint32_t *base = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
volatile uint32_t *ptr = base;
for (i = 0; i < size/sizeof(*ptr); i++)
ptr[i] = i;
munmap(ptr, size);
munmap(base, size);
}
gettimeofday(&end, NULL);
printf("Time to write %dk through a GTT map: %7.3fµs\n",
@@ -148,7 +203,8 @@ int main(int argc, char **argv)
/* mmap read */
gettimeofday(&start, NULL);
for (loop = 0; loop < 1000; loop++) {
uint32_t *ptr = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
uint32_t *base = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
volatile uint32_t *ptr = base;
int x = 0;
for (i = 0; i < size/sizeof(*ptr); i++)
@@ -157,7 +213,7 @@ int main(int argc, char **argv)
/* force overtly clever gcc to actually compute x */
ptr[0] = x;
munmap(ptr, size);
munmap(base, size);
}
gettimeofday(&end, NULL);
printf("Time to read %dk (again) through a GTT map: %7.3fµs\n",