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igt/gem_exec_nop: Repeat and average to stabilize measurements

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2015-03-24 09:15:12 +00:00
parent 4f78f9ffa2
commit cd8d3809a6
1 changed files with 52 additions and 41 deletions
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89
tests/gem_exec_nop.c
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@ -41,8 +41,22 @@
#include "drmtest.h"
#include "intel_io.h"
#define LOCAL_I915_EXEC_NO_RELOC (1<<11)
#define LOCAL_I915_EXEC_HANDLE_LUT (1<<12)
#define LOCAL_I915_EXEC_VEBOX (4<<0)
static int dcmp(const void *A, const void *B)
{
double a = *(double *)A, b = *(double *)B;
if (a < b)
return -1;
else if (a > b)
return 1;
else
return 0;
}
static double elapsed(const struct timeval *start,
const struct timeval *end,
int loop)
@ -50,56 +64,53 @@ static double elapsed(const struct timeval *start,
return (1e6*(end->tv_sec - start->tv_sec) + (end->tv_usec - start->tv_usec))/loop;
}
static int exec(int fd, uint32_t handle, int loops, unsigned ring_id)
static void loop(int fd, uint32_t handle, unsigned ring_id, const char *ring_name)
{
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 gem_exec[1];
int ret = 0;
gem_exec[0].handle = handle;
gem_exec[0].relocation_count = 0;
gem_exec[0].relocs_ptr = 0;
gem_exec[0].alignment = 0;
gem_exec[0].offset = 0;
gem_exec[0].flags = 0;
gem_exec[0].rsvd1 = 0;
gem_exec[0].rsvd2 = 0;
execbuf.buffers_ptr = (uintptr_t)gem_exec;
execbuf.buffer_count = 1;
execbuf.batch_start_offset = 0;
execbuf.batch_len = 8;
execbuf.cliprects_ptr = 0;
execbuf.num_cliprects = 0;
execbuf.DR1 = 0;
execbuf.DR4 = 0;
execbuf.flags = ring_id;
i915_execbuffer2_set_context_id(execbuf, 0);
execbuf.rsvd2 = 0;
while (loops-- && ret == 0) {
if (drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf))
ret = -errno;
}
gem_sync(fd, handle);
return ret;
}
static void loop(int fd, uint32_t handle, unsigned ring_id, const char *ring_name)
{
int count;
gem_require_ring(fd, ring_id);
for (count = 1; count <= SLOW_QUICK(1<<17, 1<<4); count <<= 1) {
struct timeval start, end;
memset(&gem_exec, 0, sizeof(gem_exec));
gem_exec[0].handle = handle;
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (uintptr_t)gem_exec;
execbuf.buffer_count = 1;
execbuf.flags = ring_id;
execbuf.flags |= LOCAL_I915_EXEC_HANDLE_LUT;
execbuf.flags |= LOCAL_I915_EXEC_NO_RELOC;
if (drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf)) {
execbuf.flags = ring_id;
do_ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
}
gem_sync(fd, handle);
for (count = 1; count <= SLOW_QUICK(1<<17, 1<<4); count <<= 1) {
const int reps = 9;
double t[reps], sum;
int n;
for (n = 0; n < reps; n++) {
struct timeval start, end;
int loops = count;
gettimeofday(&start, NULL);
igt_assert_eq(exec(fd, handle, count, ring_id), 0);
while (loops--)
do_ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
gem_sync(fd, handle);
gettimeofday(&end, NULL);
t[n] = elapsed(&start, &end, count);
}
qsort(t, reps, sizeof(double), dcmp);
sum = 0;
for (n = 2; n < reps-2; n++)
sum += t[n];
sum /= reps - 4;
igt_info("Time to exec x %d: %7.3fµs (ring=%s)\n",
count, elapsed(&start, &end, count), ring_name);
count, sum, ring_name);
fflush(stdout);
}
}