| Summary: | Low fps in Wayland session with fractional scaling | ||
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| Product: | [Plasma] kwin | Reporter: | Matej Mrenica <matejm98mthw> |
| Component: | wayland-generic | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | RESOLVED NOT A BUG | ||
| Severity: | major | CC: | germano.massullo, joseph, katyaberezyaka, kde, matejm98mthw, vlad.zahorodnii |
| Priority: | NOR | Keywords: | efficiency |
| Version: | 5.20.90 | ||
| Target Milestone: | --- | ||
| Platform: | Arch Linux | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
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Description
Matej Mrenica
2020-07-19 08:38:54 UTC
After further testing, it looks like Gnome wayland isn't any faster, meaning this issue is likely not caused by Kwin. I would still like to help finding out why is this happening. Performance is a lot better in Plasma 5.20 Beta, but there are still frame-drops in certain situations. One of the situations where frame rate drops significantly is scrolling in Dolphin. Every time I turn the mouse wheel there is a red spike in the fps meter (30 fps). Also grabbing the the scrollbar and moving it up and down causes a drop depending on the movement speed it can be as low as 30fps while the scrollbar is moving. This is in Plasma 5.20.0 Sometimes I notice the mouse pointer going at low FPS, so it's like it is warping. qdbus org.kde.KWin /KWin supportInformation ========================== Version ======= KWin version: 5.20.1 Qt Version: 5.15.1 Qt compile version: 5.15.1 XCB compile version: 1.13.1 Operation Mode: Xwayland Build Options ============= KWIN_BUILD_DECORATIONS: yes KWIN_BUILD_TABBOX: yes KWIN_BUILD_ACTIVITIES: yes HAVE_DRM: yes HAVE_GBM: yes HAVE_EGL_STREAMS: yes HAVE_X11_XCB: yes HAVE_EPOXY_GLX: yes HAVE_WAYLAND_EGL: yes X11 === Vendor: Fedora Project Vendor Release: 12009000 Protocol Version/Revision: 11/0 SHAPE: yes; Version: 0x11 RANDR: yes; Version: 0x14 DAMAGE: yes; Version: 0x11 Composite: yes; Version: 0x4 RENDER: yes; Version: 0xb XFIXES: yes; Version: 0x50 SYNC: yes; Version: 0x31 GLX: yes; Version: 0x0 Decoration ========== Plugin: org.kde.breeze Theme: Plugin recommends border size: None Blur: 0 onAllDesktopsAvailable: true alphaChannelSupported: true closeOnDoubleClickOnMenu: false decorationButtonsLeft: 0, 2 decorationButtonsRight: 6, 3, 4, 5 borderSize: 0 gridUnit: 12 font: Droid Sans [1ASC],11,-1,5,50,0,0,0,0,0 smallSpacing: 3 largeSpacing: 12 Platform ========== Name: DRM Active: true Atomic Mode Setting: true Using EGL Streams: false Options ======= focusPolicy: 0 xwaylandCrashPolicy: xwaylandMaxCrashCount: 3 nextFocusPrefersMouse: false clickRaise: true autoRaise: false autoRaiseInterval: 0 delayFocusInterval: 0 shadeHover: false shadeHoverInterval: 250 separateScreenFocus: false placement: 4 focusPolicyIsReasonable: true borderSnapZone: 10 windowSnapZone: 10 centerSnapZone: 0 snapOnlyWhenOverlapping: false rollOverDesktops: true focusStealingPreventionLevel: 1 operationTitlebarDblClick: 5000 operationMaxButtonLeftClick: 5000 operationMaxButtonMiddleClick: 5015 operationMaxButtonRightClick: 5014 commandActiveTitlebar1: 0 commandActiveTitlebar2: 28 commandActiveTitlebar3: 2 commandInactiveTitlebar1: 4 commandInactiveTitlebar2: 28 commandInactiveTitlebar3: 2 commandWindow1: 7 commandWindow2: 8 commandWindow3: 8 commandWindowWheel: 28 commandAll1: 10 commandAll2: 3 commandAll3: 14 keyCmdAllModKey: 16777251 showGeometryTip: false condensedTitle: false electricBorderMaximize: true electricBorderTiling: true electricBorderCornerRatio: 0.25 borderlessMaximizedWindows: false killPingTimeout: 5000 hideUtilityWindowsForInactive: true compositingMode: 1 useCompositing: true hiddenPreviews: 1 glSmoothScale: 2 xrenderSmoothScale: false maxFpsInterval: 16666666 refreshRate: 0 vBlankTime: 6000000 glStrictBinding: false glStrictBindingFollowsDriver: true glCoreProfile: true glPreferBufferSwap: 101 glPlatformInterface: 2 windowsBlockCompositing: true Screen Edges ============ desktopSwitching: false desktopSwitchingMovingClients: false cursorPushBackDistance: 1x1 timeThreshold: 150 reActivateThreshold: 350 actionTopLeft: 0 actionTop: 0 actionTopRight: 0 actionRight: 0 actionBottomRight: 0 actionBottom: 0 actionBottomLeft: 0 actionLeft: 0 Screens ======= Multi-Head: no Active screen follows mouse: yes Number of Screens: 1 Screen 0: --------- Name: DP-3 Geometry: 0,0,3072x1728 Scale: 1.25 Refresh Rate: 59.997 Compositing =========== Compositing is active Compositing Type: OpenGL OpenGL vendor string: X.Org OpenGL renderer string: AMD Radeon (TM) RX 480 Graphics (POLARIS10, DRM 3.38.0, 5.8.16-300.fc33.x86_64, LLVM 11.0.0) OpenGL version string: 4.6 (Core Profile) Mesa 20.2.1 OpenGL platform interface: EGL OpenGL shading language version string: 4.60 Driver: RadeonSI GPU class: Arctic Islands OpenGL version: 4.6 GLSL version: 4.60 Mesa version: 20.2.1 Linux kernel version: 5.8.16 Direct rendering: Requires strict binding: no GLSL shaders: yes Texture NPOT support: yes Virtual Machine: no OpenGL 2 Shaders are used Painting blocks for vertical retrace: no Loaded Effects: --------------- kwin4_effect_sessionquit screenshot desktopgrid kwin4_effect_translucency colorpicker kwin4_effect_fullscreen kwin4_effect_frozenapp presentwindows kwin4_effect_dialogparent highlightwindow blur contrast startupfeedback kscreen Currently Active Effects: ------------------------- blur contrast Effect Settings: ---------------- kwin4_effect_sessionquit: pluginId: kwin4_effect_sessionquit isActiveFullScreenEffect: false screenshot: desktopgrid: zoomDuration: 300 border: 10 desktopNameAlignment: 0 layoutMode: 0 customLayoutRows: 2 usePresentWindows: true kwin4_effect_translucency: pluginId: kwin4_effect_translucency isActiveFullScreenEffect: false colorpicker: kwin4_effect_fullscreen: pluginId: kwin4_effect_fullscreen isActiveFullScreenEffect: false kwin4_effect_frozenapp: pluginId: kwin4_effect_frozenapp isActiveFullScreenEffect: false presentwindows: layoutMode: 0 showCaptions: true showIcons: true doNotCloseWindows: false ignoreMinimized: false accuracy: 20 fillGaps: true fadeDuration: 150 showPanel: false leftButtonWindow: 1 rightButtonWindow: 2 middleButtonWindow: 0 leftButtonDesktop: 2 middleButtonDesktop: 0 rightButtonDesktop: 0 kwin4_effect_dialogparent: pluginId: kwin4_effect_dialogparent isActiveFullScreenEffect: false highlightwindow: blur: contrast: startupfeedback: type: 1 kscreen: Can you also confirm low fps with the built-in fps meter in, for example, Dolphin when scrolling in a big folder? I personally, always have an fps drop to/bellow 30fps in that situation. Also yesterday my fps was constantly around ~25 because baloo was doing something in the background. As if the rendering thread was waiting for rest of the system or something like that. (In reply to Matej Mrenica from comment #5) > Can you also confirm low fps with the built-in fps meter in, for example, > Dolphin when scrolling in a big folder? I personally, always have an fps > drop to/bellow 30fps in that situation. Also yesterday my fps was constantly > around ~25 because baloo was doing something in the background. As if the > rendering thread was waiting for rest of the system or something like that. I confirm with the FPS meter. I got the problem for example moving the Dolphin window around the screen. I cannot reproduce it everytime, but it is not so hard to trigger it I believe things should be slightly better with 5.20.3. See also https://invent.kde.org/plasma/kwayland-server/-/commit/13d878d22b89ec0c79b434080f76390487b63c2c Disabling fractional scaling actually does fix this issue, even though I said otherwise before. So the issue is somewhere in the scaling. To turn scaling back on one can export GDK_DPI_SCALE for gtk apps. Also for QT apps one could use QT_SCALE_FACTOR, but it breaks Plasma, is that an issue? Performance is something we are always trying to improve. I don't think we can track that within a bug report unless there is something more specific. Right now 1.25 scaling will make clients scale to 2x internally, which is a lot more pixels. This is something we hope to address later upstream.
>To turn scaling back on one can export GDK_DPI_SCALE for gtk apps. Also for QT apps one could use QT_SCALE_FACTOR, but it breaks Plasma, is that an issue?
It's not the direction we want to take, it has a lot of issues with multiscreen.
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