On 2025-01-13 12:40, Tvrtko Ursulin wrote: > On 10/01/2025 09:14, Michel Dänzer wrote: >> On 2025-01-09 17:55, Tvrtko Ursulin wrote: >>> On 09/01/2025 15:08, Michel Dänzer wrote: >>>> On 2025-01-03 13:31, Christian König wrote: >>>> >>>>> What FIFO is still missing compared to RR is some sort of fairness >>>>> between queues. E.g. a queues which hasn't submitted something in a while >>>>> might get a bonus for their submissions compared to a queue which submits >>>>> stuff all the time (or something like that). >>>> >>>> The lack of that could indeed explain the scenario above, if the game >>>> submits its GPU job for frame n+1 before Xwayland submits its GPU job for >>>> presenting frame n. >>> >>> I would be keen to experiment with this. There is that last patch in v2 of >>> my series which scales the deadlines based on queue depth. So for a client >>> which submits two frames it could be enough (in principle, not the actually >>> posted version) to push out the deadline at qd=2 so a client which never >>> breaks qd=1 can reliably overtake it. >>> >>> What would really be great if you could suggest me as easy to set up as >>> possible test case with objective measuring criteria. And it would have to >>> run on AMD. Quake II RTX under XWayland as the GitLab issue suggest or >>> there is more to it? Does it has to be GNOME? >> >> Don't think it has to be. >> >>> Any way to run it programmatically and get a performance number out? >> >> This could be tricky, since the game itself reports the same frame rate in >> both cases. You'd have to compare the frame times in the compositor instead. > > So missed frames in the compositor?
Rather in Xwayland, the compositor is where it's visible to the user. >> Also, the issue might no longer be reproducible in this particular scenario >> with current Xwayland, because it should no longer do any GPU copies for >> presentation but just forward the client buffers to the compositor. > Do you have an idea how could we find out more about that what you said: > "people are saying RR works better than FIFO for some gaming scenarios even > with current Xwayland, which shouldn't do any GPU copies for presentation of > fullscreen windows"? Other than asking affected users for more information, not offhand. -- Earthling Michel Dänzer \ GNOME / Xwayland / Mesa developer https://redhat.com \ Libre software enthusiast
