On Fri, 2021-09-17 at 20:49 +0300, Ville Syrjälä wrote: > On Fri, Sep 17, 2021 at 05:02:21PM +0000, Souza, Jose wrote: > > On Fri, 2021-09-17 at 16:04 +0300, Ville Syrjälä wrote: > > > On Thu, Sep 16, 2021 at 05:09:08PM +0000, Souza, Jose wrote: > > > > On Thu, 2021-09-16 at 16:17 +0300, Ville Syrjälä wrote: > > > > > On Wed, Sep 15, 2021 at 06:18:35PM +0000, Souza, Jose wrote: > > > > > > On Wed, 2021-09-15 at 17:58 +0300, Ville Syrjälä wrote: > > > > > > > On Tue, Sep 14, 2021 at 02:25:05PM -0700, José Roberto de Souza wrote: > > > > > > > > Not sure why but when moving the cursor fast it causes some artifacts > > > > > > > > of the cursor to be left in the cursor path, adding some pixels above > > > > > > > > the cursor to the damaged area fixes the issue, so leaving this as a > > > > > > > > workaround until proper fix is found. > > > > > > > > > > > > > > Have you tried warping the cursor clear across the screen while > > > > > > > a partial update is already pending? I think it will go badly. > > > > > > > > > > > > You mean move the cursor for example from 0x0 to 500x500 in one frame? > > > > > > It will mark as damaged the previous area and the new one. > > > > > > > > > > Legacy cursor updates bypass all that stuff so you're not going to > > > > > updating the sel fetch area for the other planes. > > > > > > > > > > > > > > > > > > > > > > > > > In fact I'm thinking the mailbox style legacy cursor updates are just > > > > > > > fundementally incompatible with partial updates since the cursor > > > > > > > can move outside of the already committed update region any time. > > > > > > > Ie. I suspect while the cursor is visible we simply can't do partial > > > > > > > updates. > > > > > > > > > > > > Probably I did not understand what you want to say, but each cursor update will be in one frame, updating the necessary area. > > > > > > > > > > The legacy cursor uses mailbox updates so there is no 1:1 relationship > > > > > between actual scanned out frames and cursor ioctl calls. You can > > > > > have umpteen thousand cursor updates per frame. > > > > > > > > Not if intel_legacy_cursor_update() is changed to go to the slow path and do one atomic commit for each move. > > > > https://patchwork.freedesktop.org/patch/453192/?series=94522&rev=1 > > > > > > That's not going to fly. The whole reason for the legacy cursor thing is > > > that X likes to do thousands of cursor updates per frame. > > > > From user experience perspective there is no issues in converting to atomic commit, those 3 videos that I shared with you have this conversion. > > I don't know what you've tested but the legacy cursor fastpath is very > much needed. We've have numerous bug reports whenever it has > accidentally regressed, and I've witnessed the carnage myself as well. > Hmm, I guess you didn't actually disable it fully. To do that you > would have to clear state->legacy_cursor_update explicitly somewhere. Thanks for pointing out state->legacy_cursor_update and yes setting it to false makes causes the cursor to lag. > > Either way I just retested the earlier patches just with the nonblocking > commit for dirtyfb hacked in, and I left the cursor code using the > half fast path you made it take. The user experience is still as bad > as before. Just moving the mouse around makes glxgears stutter, and the > reported fps drops to ~400 from that alone. And doing anything more > involved like moving windows around is still a total fail. I have tested it in a TGL and ADL-P, will try to get some gen9 to try it. Other than that I don't know what could this big difference between our setups. I'm using Mate like you with 'enable software compositing window manager' disabled. >
