The first dispatch incurs the cost of waking up the device, so also
measure after issuing a spinner to keep the device awake as we submit.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
tests/i915/gem_exec_latency.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/tests/i915/gem_exec_latency.c b/tests/i915/gem_exec_latency.c
index b16b25e53..e726385bd 100644
--- a/tests/i915/gem_exec_latency.c
+++ b/tests/i915/gem_exec_latency.c
@@ -55,8 +55,9 @@
#define ENGINE_FLAGS (I915_EXEC_RING_MASK | LOCAL_I915_EXEC_BSD_MASK)
-#define CORK 0x1
-#define PREEMPT 0x2
+#define LIVE 0x1
+#define CORK 0x2
+#define PREEMPT 0x4
static unsigned int ring_size;
static double rcs_clock;
@@ -120,6 +121,7 @@ static void latency_on_ring(int fd,
struct drm_i915_gem_exec_object2 obj[3];
struct drm_i915_gem_relocation_entry reloc;
struct drm_i915_gem_execbuffer2 execbuf;
+ igt_spin_t *spin = NULL;
IGT_CORK_HANDLE(c);
volatile uint32_t *reg;
unsigned repeats = ring_size;
@@ -189,6 +191,9 @@ static void latency_on_ring(int fd,
execbuf.buffer_count = 3;
}
+ if (flags & LIVE)
+ spin = igt_spin_batch_new(fd, .engine = ring);
+
start = *reg;
for (j = 0; j < repeats; j++) {
uint64_t presumed_offset = reloc.presumed_offset;
@@ -204,6 +209,7 @@ static void latency_on_ring(int fd,
end = *reg;
igt_assert(reloc.presumed_offset == obj[1].offset);
+ igt_spin_batch_free(fd, spin);
if (flags & CORK)
igt_cork_unplug(&c);
@@ -696,6 +702,11 @@ igt_main
e->exec_id | e->flags,
e->name, 0);
+ igt_subtest_f("%s-live-dispatch", e->name)
+ latency_on_ring(device,
+ e->exec_id | e->flags,
+ e->name, LIVE);
+
igt_subtest_f("%s-poll", e->name)
poll_ring(device,
e->exec_id | e->flags,
@@ -715,6 +726,10 @@ igt_main
e->name,
0);
+ igt_subtest_f("%s-live-dispatch-queued", e->name)
+ latency_on_ring(device,
+ e->exec_id | e->flags,
+ e->name, LIVE | CORK);
igt_subtest_f("%s-dispatch-queued", e->name)
latency_on_ring(device,
e->exec_id | e->flags,
--
2.20.1
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