From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org Subject: [Bug 74195] New: Responsivity to input with vsync on is slower after update Date: Wed, 29 Jan 2014 20:23:28 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1245086895==" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: nouveau-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Errors-To: nouveau-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org List-Id: nouveau.vger.kernel.org --===============1245086895== Content-Type: multipart/alternative; boundary="1391027008.0C0ADC31.28511"; charset="us-ascii" --1391027008.0C0ADC31.28511 Date: Wed, 29 Jan 2014 20:23:28 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=74195 Priority: medium Bug ID: 74195 Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Summary: Responsivity to input with vsync on is slower after update QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org Severity: normal Classification: Unclassified OS: Linux (All) Reporter: janjanjanx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org 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) -- You are receiving this mail because: You are the assignee for the bug. --1391027008.0C0ADC31.28511 Date: Wed, 29 Jan 2014 20:23:28 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"
Priority medium
Bug ID 74195
Assignee nouveau@lists.freedesktop.org
Summary Responsivity to input with vsync on is slower after update
QA Contact xorg-team@lists.x.org
Severity normal
Classification Unclassified
OS Linux (All)
Reporter janjanjanx@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)

You are receiving this mail because:
  • You are the assignee for the bug.
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