Hi Tvrtko,
Thanks for this patchset! I applied this patchset to the RPi downstream
kernel 6.13.7 [1] and saw an FPS improvement of approximately 5.85%
with "vkgears -present-mailbox" on the RPi 5.
I did five 100 seconds runs on each kernel and here are my results:
### 6.13.7
| Run | Min FPS | Max FPS | Avg FPS |
|----------|-------------|-------------|-------------|
| Run #1 | 6646.52 | 6874.77 | 6739.313 |
| Run #2 | 5387.04 | 6723.274 | 6046.773 |
| Run #3 | 6230.49 | 6823.47 | 6423.923 |
| Run #4 | 5269.678 | 5870.59 | 5501.858 |
| Run #5 | 5504.54 | 6285.91 | 5859.724 |
* Overall Avg FPS: 6114.318 FPS
### 6.13.7 + DRM Syncobj optimisations
| Run | Min FPS | Max FPS | Avg FPS |
|----------|-------------|-------------|-------------|
| Run #1 | 6089.05 | 7296.27 | 6859.724 |
| Run #2 | 6022.48 | 7264 | 6818.518 |
| Run #3 | 5987.68 | 6188.77 | 6041.365 |
| Run #4 | 5699.27 | 6448.99 | 6190.374 |
| Run #5 | 6199.27 | 6791.15 | 6450.900 |
* Overall Avg FPS: 6472.176 FPS
[1] https://github.com/raspberrypi/linux/tree/rpi-6.13.y
Best Regards,
- Maíra
On 18/03/25 12:54, Tvrtko Ursulin wrote:
A small set of drm_syncobj optimisations which should make things a tiny bit
more efficient on the CPU side of things.
Improvement seems to be around 1.5%* more FPS if observed with "vkgears
-present-mailbox" on a Steam Deck Plasma desktop, but I am reluctant to make a
definitive claim on the numbers since there is some run to run variance. But, as
suggested by Michel Dänzer, I did do a five ~100 second runs on the each kernel
to be able to show the ministat analysis.
x before
+ after
+------------------------------------------------------------+
| x + |
| x x + |
| x xx ++++ |
| x x xx x ++++ |
| x xx x xx x+ ++++ |
| xxxxx xxxxxx+ ++++ + + |
| xxxxxxx xxxxxx+x ++++ +++ |
| x xxxxxxxxxxx*xx+* x++++++++ ++ |
| x x xxxxxxxxxxxx**x*+*+*++++++++ ++++ + |
| xx x xxxxxxxxxx*x****+***+**+++++ ++++++ |
|x xxx x xxxxx*x****x***********+*++**+++++++ + + +|
| |_______A______| |
| |______A_______| |
+------------------------------------------------------------+
N Min Max Median Avg Stddev
x 135 21697.58 22809.467 22321.396 22307.707 198.75011
+ 118 22200.746 23277.09 22661.4 22671.442 192.10609
Difference at 95.0% confidence
363.735 +/- 48.3345
1.63054% +/- 0.216672%
(Student's t, pooled s = 195.681)
Tvrtko Ursulin (7):
drm/syncobj: Remove unhelpful helper
drm/syncobj: Do not allocate an array to store zeros when waiting
drm/syncobj: Avoid one temporary allocation in drm_syncobj_array_find
drm/syncobj: Use put_user in drm_syncobj_query_ioctl
drm/syncobj: Avoid temporary allocation in
drm_syncobj_timeline_signal_ioctl
drm/syncobj: Add a fast path to drm_syncobj_array_wait_timeout
drm/syncobj: Add a fast path to drm_syncobj_array_find
drivers/gpu/drm/drm_syncobj.c | 281 ++++++++++++++++++----------------
1 file changed, 147 insertions(+), 134 deletions(-)
