<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows" href="https://bugs.freedesktop.org/show_bug.cgi?id=106175#c45">Comment # 45</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows" href="https://bugs.freedesktop.org/show_bug.cgi?id=106175">bug 106175</a> from <a class="email" href="mailto:rropid@gmail.com" title="rropid@gmail.com">rropid@gmail.com</a> <pre>(In reply to bmilreu from <a href="show_bug.cgi?id=106175#c43">comment #43</a>) > If devs want an easy test case, use these links for reproducing it in > chromium: > > <a href="https://www.vsynctester.com/">https://www.vsynctester.com/</a> > <a href="https://www.testufo.com/photo">https://www.testufo.com/photo</a> > <a href="https://www.slither.io">https://www.slither.io</a> > > move the cursor around, move/resize some windows. you will notice it > > the vsync/cursor stutters and frame-skips are pretty noticeable with dc=1 on > all three links > > KWin, compton, TearFree, mutter, xfwm4 all have the same problems. I just tried dc=1 and I only seem to have a problem if I use TearFree. Things are totally fine without TearFree. To be clear about what I'm doing here right now: I made sure DC is enabled: $ systool -vm amdgpu | grep dc dc = "1" $ dmesg | grep -i display [ 1.014297] [drm] Display Core initialized with v3.1.59! I removed TearFree from my X config: $ cat /etc/X11/xorg.conf.d/20-amdgpu.conf Section "OutputClass" Identifier "my amdgpu settings" MatchDriver "amdgpu" Option "DRI" "3" EndSection And I started Compton like this to make sure it's a clean config: $ compton --config /dev/null --backend glx --vsync opengl With this setup, I don't seem to have any stutter. I visited the websites you mention in a Chromium window, then opened another window and tried moving things around and resizing. It behaves fine, same as what I know from normally using dc=0. Kernel is 4.19.2, Mesa 18.2.4, Xorg 1.20.3, the GPU is a RX480, monitor is 60 Hz. After I had typed this, I have now added TearFree to the X config and restarted X: $ cat /etc/X11/xorg.conf.d/20-amdgpu.conf Section "OutputClass" Identifier "my amdgpu settings" MatchDriver "amdgpu" Option "TearFree" "true" Option "DRI" "3" EndSection Now, with TearFree enabled, things are super terrible. Trying to move a window around has extreme stutter, it seems to drop frames. If I restart Compton with "GALLIUM_HUD=fps" and then try moving a window around in circles, I can see it stays below 40 fps instead of hitting the 60 fps that it should be running at.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>