[Nouveau] [Bug 74195] New: Responsivity to input with vsync on is slower after update

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74195

          Priority: medium
            Bug ID: 74195
          Assignee: nouveau at lists.freedesktop.org
           Summary: Responsivity to input with vsync on is slower after
                    update
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: janjanjanx at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

I use compton compositing manager wich uses DRM_IOCTL_WAIT_VBLANK for vsync.
Recently I updated from kernel 3.9 to 3.13 and responsivness (or "input lag" or
however it's called) got much worse, mostly noticable when moving windows or
scrolling. With kernel 3.13 the windows are 3-5 frames behind mouse when
moving, on 3.9 kernel they were only 0-1 frames behind. I also tried kwin, wich
had less noticable slowdown (from 1-2 frames behind to 3-5 frames behind).

I tried different kernel versions from nouveau git and found out, that the
slowdown was caused by this commit:
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=0fa9061ae8c10a9178d696cf48d94c3bf2848f9f

I guess the commit is important and can't be undone, but the bad responsiveness
really annoys me, so I would be glad if there is a solution.

GPU is GTX 560 Ti
xserver 1.14.5
xorg-video-nouveau 1.0.10
libdrm 2.4.52
(Debian sid)

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