all, On Tue, Jan 20, 2015 at 06:48:42AM +0100, Daniel Vetter wrote: > On Mon, Jan 19, 2015 at 08:40:24AM -0800, Matt Roper wrote: > > On Mon, Jan 19, 2015 at 11:04:04AM +0000, Chris Wilson wrote: > > > On Mon, Jan 19, 2015 at 11:51:43AM +0100, Daniel Vetter wrote: > > > > There's also an issue in (most) X drivers which exaberates this > > > > issues: When changing the cursor buffer the X cursor code does a a) > > > > disable cursor b) update cursor image c) enable cursor cycle. > > > > > > Notably not -intel on which the bug has been observed. And more > > > importantly, the slow downs don't seem to correlate with cursor change, > > > just cursor movement. > > > -Chris > > > > > > -- > > > Chris Wilson, Intel Open Source Technology Centre > > > > It seems that the simple fix for this case (movement only) is to just > > skip the prepare_fb/cleanup_fb calls (and the associated vblank wait) in > > the transitional plane helper when newfb == oldfb. I just posted a > > small patch that makes that change (and solves the cursor lag for me). > > > > This won't solve the case if userspace uses a different framebuffer for > > each update (while trying to update faster than the refresh rate). Is > > there any existing userspace that behaves this way that we can test > > with? > > Hm, I've thought I've merged that patch already: > > commit ab58e3384b9f9863bfd029b458ff337d381bf6d2 > Author: Daniel Vetter <daniel.vetter@xxxxxxxx> > Date: Mon Nov 24 20:42:42 2014 +0100 > > drm/atomic-helper: Skip vblank waits for unchanged fbs > > Or is the problem here that the transitional plane helpers aren't up to > the task? If so please reference that in your patch. > > And we still need a hack for the "changed fb cursor" issue, I'll whip > something up. > -Daniel > -- > Daniel Vetter > Software Engineer, Intel Corporation > +41 (0) 79 365 57 48 - http://blog.ffwll.ch Just checking if anyone has come up with a fix. I am still stuck at next-20150112 because of this bug. -- - Jeremiah Mahler _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
