[Intel-gfx] [PATCH igt] igt/gem_sync: Sync before starting the clock

[Chris Wilson]

Hide the initial setup cost of a new batch by performing it before we
start the clock for measuring the execute-wait latency.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/gem_sync.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/gem_sync.c b/tests/gem_sync.c
index 8ed9760d..c9e2f014 100644
--- a/tests/gem_sync.c
+++ b/tests/gem_sync.c
@@ -138,6 +138,7 @@ sync_ring(int fd, unsigned ring, int num_children, int timeout)
 		execbuf.buffer_count = 1;
 		execbuf.flags = engines[child % num_engines];
 		gem_execbuf(fd, &execbuf);
+		gem_sync(fd, object.handle);
 
 		start = gettime();
 		cycles = 0;
@@ -553,6 +554,7 @@ sync_all(int fd, int num_children, int timeout)
 		execbuf.buffers_ptr = to_user_pointer(&object);
 		execbuf.buffer_count = 1;
 		gem_execbuf(fd, &execbuf);
+		gem_sync(fd, object.handle);
 
 		start = gettime();
 		cycles = 0;
@@ -773,6 +775,7 @@ preempt(int fd, unsigned ring, int num_children, int timeout)
 		execbuf.flags = engines[child % num_engines];
 		execbuf.rsvd1 = ctx[1];
 		gem_execbuf(fd, &execbuf);
+		gem_sync(fd, object.handle);
 
 		start = gettime();
 		cycles = 0;
-- 
2.14.2