diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2020-12-22 09:50:00 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2020-12-22 10:29:07 +0000 |
| commit | c95748defb28d7eb3e7b477cdac4709190ac61e1 (patch) | |
| tree | 68cd4af4955fdcb695be85aea2d0b805f9018fe3 /tests/i915/gem_exec_fair.c | |
| parent | c1535f3a84ac3924269b9b080939121f016a9a30 (diff) | |
i915/gem_exec_fair: Improve overhead estimates
Refine the switching overhead by taking account of timeslicing.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Diffstat (limited to 'tests/i915/gem_exec_fair.c')
| -rw-r--r-- | tests/i915/gem_exec_fair.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/tests/i915/gem_exec_fair.c b/tests/i915/gem_exec_fair.c index b48484f4..17ea5330 100644 --- a/tests/i915/gem_exec_fair.c +++ b/tests/i915/gem_exec_fair.c @@ -921,9 +921,11 @@ static uint64_t time_get_mono_ns(void) static void deadline(int i915, int duration, unsigned int flags) { - const uint64_t frame_ns = 33670 * 1000; /* 29.7fps */ - const uint64_t parent_ns = 400 * 1000; - const uint64_t switch_ns = 600 * 1000; + const int64_t frame_ns = 33670 * 1000; /* 29.7fps */ + const int64_t parent_ns = 400 * 1000; + const int64_t switch_ns = 50 * 1000; + const int64_t overhead_ns = /* estimate timeslicing overhead */ + (frame_ns / 1000 / 1000 + 2) * switch_ns + parent_ns; struct intel_execution_engine2 pe = pick_default(i915); struct intel_execution_engine2 ve = pick_engine(i915, "vcs0"); struct drm_i915_gem_exec_fence *fences = calloc(sizeof(*fences), 32); @@ -954,7 +956,7 @@ static void deadline(int i915, int duration, unsigned int flags) int timeline = sw_sync_timeline_create(); int nframes = duration * NSEC64 / frame_ns + 1; int num_children = (1 << n) - 1; - int child_ns = (frame_ns - parent_ns - switch_ns) / num_children - switch_ns; + int child_ns = (frame_ns - overhead_ns) / num_children - switch_ns; struct { int child[2], parent[2]; } *link; uint64_t start, over; int missed; |