Distinguish between the latency required to switch away from the
pollable spinner into the target nops from the client wakeup of
synchronisation on the last nop.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
tests/gem_sync.c | 35 +++++++++++++++++++++++++++++++----
1 file changed, 31 insertions(+), 4 deletions(-)
diff --git a/tests/gem_sync.c b/tests/gem_sync.c
index 60d61a02e..493ae61df 100644
--- a/tests/gem_sync.c
+++ b/tests/gem_sync.c
@@ -207,7 +207,7 @@ wakeup_ring(int fd, unsigned ring, int timeout, int wlen)
const uint32_t bbe = MI_BATCH_BUFFER_END;
struct drm_i915_gem_exec_object2 object;
struct drm_i915_gem_execbuffer2 execbuf;
- double end, this, elapsed, now;
+ double end, this, elapsed, now, baseline;
unsigned long cycles;
uint32_t cmd;
igt_spin_t *spin;
@@ -233,6 +233,32 @@ wakeup_ring(int fd, unsigned ring, int timeout, int wlen)
igt_spin_batch_end(spin);
gem_sync(fd, object.handle);
+ for (int warmup = 0; warmup <= 1; warmup++) {
+ end = gettime() + timeout/10.;
+ elapsed = 0;
+ cycles = 0;
+ do {
+ *spin->batch = cmd;
+ *spin->running = 0;
+ gem_execbuf(fd, &spin->execbuf);
+ while (!READ_ONCE(*spin->running))
+ ;
+
+ this = gettime();
+ igt_spin_batch_end(spin);
+ gem_sync(fd, spin->handle);
+ now = gettime();
+
+ elapsed += now - this;
+ cycles++;
+ } while (now < end);
+ baseline = elapsed / cycles;
+ }
+ igt_info("%s%saseline %ld cycles: %.3f us\n",
+ names[child % num_engines] ?: "",
+ names[child % num_engines] ? " b" : "B",
+ cycles, elapsed*1e6/cycles);
+
end = gettime() + timeout;
elapsed = 0;
cycles = 0;
@@ -254,16 +280,17 @@ wakeup_ring(int fd, unsigned ring, int timeout, int wlen)
elapsed += now - this;
cycles++;
} while (now < end);
+ elapsed -= cycles * baseline;
- igt_info("%s%sompleted %ld cycles: %.3f us\n",
+ igt_info("%s%sompleted %ld cycles: %.3f + %.3f us\n",
names[child % num_engines] ?: "",
names[child % num_engines] ? " c" : "C",
- cycles, elapsed*1e6/cycles);
+ cycles, 1e6*baseline, elapsed*1e6/cycles);
igt_spin_batch_free(fd, spin);
gem_close(fd, object.handle);
}
- igt_waitchildren_timeout(timeout+10, NULL);
+ igt_waitchildren_timeout(2*timeout, NULL);
igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
}
--
2.18.0
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