https://bugs.kde.org/show_bug.cgi?id=499560
Bug ID: 499560
Summary: plasmashell leaks 1-4 GB of VRAM over a period of less
than 20 hours
Classification: Plasma
Product: plasmashell
Version: git-stable-Plasma/6.2
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: generic-performance
Assignee: plasma-b...@kde.org
Reporter: k...@kaishome.de
Target Milestone: 1.0
SUMMARY
According to nvidia-smi, plasmashell leaks a lot of VRAM over a period of less
than 20 hours even. This also happens while the system is actively used, e.g.
during gaming, and finally leads to low gaming performance, render problems,
OBS render dropouts, and some apps may crash. That instability situation has
become a lot better since I last tried but it still exists and the following
dmesg output can be observed:
[73453.409090] [drm:nv_drm_gem_alloc_nvkms_memory_ioctl [nvidia_drm]] *ERROR*
[nvidia-drm] [GPU ID 0x00000100] Failed to allocate NVKMS memory for GEM object
[73453.409420] [drm:nv_drm_gem_alloc_nvkms_memory_ioctl [nvidia_drm]] *ERROR*
[nvidia-drm] [GPU ID 0x00000100] Failed to allocate NVKMS memory for GEM object
[73453.426989] [drm:nv_drm_gem_alloc_nvkms_memory_ioctl [nvidia_drm]] *ERROR*
[nvidia-drm] [GPU ID 0x00000100] Failed to allocate NVKMS memory for GEM object
[73453.427009] [drm:nv_drm_gem_alloc_nvkms_memory_ioctl [nvidia_drm]] *ERROR*
[nvidia-drm] [GPU ID 0x00000100] Failed to allocate NVKMS memory for GEM object
[73469.422839] NVRM: Xid (PCI:0000:01:00): 69, pid=508775, name=chrome, Class
Error: ChId 0056, Class 0000902d, Offset 0000023c, Data 00000000, ErrorCode
00000004
[73483.852230] NVRM: Xid (PCI:0000:01:00): 69, pid=508839, name=chrome, Class
Error: ChId 0056, Class 0000902d, Offset 0000023c, Data 00000000, ErrorCode
00000004
But this one is not the point here (nvidia-drivers should probably handle that
better), it's just a side effect of plasmashell leaking VRAM memory at an
exceptionally high rate while the system is idle.
I've used `kcmshell6 qtquicksettings` to switch between automatic and threaded
render loop, than restart to apply. With threaded render loop, the rate at
which plasmashell leaks VRAM seems to be 3-4 times lower. Thus I'm currently
running with threaded render loop.
STEPS TO REPRODUCE
1. Reboot into a wayland session, open some Chrome windows and Steam, one
control bar per monitor
2. check VRAM usage with nvidia-smi
3. turn off monitors, leave the system idle for 20 hours, turn monitors back on
4. check VRAM usage with nvidia-smi
OBSERVED RESULT
Wed Feb 5 01:23:34 2025
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 570.86.16 Driver Version: 570.86.16 CUDA
Version: 12.8 |
|-----------------------------------------+------------------------+----------------------+
| 0 N/A N/A 469044 G /usr/bin/plasmashell
452MiB |
+-----------------------------------------------------------------------------------------+
Wed Feb 5 19:47:26 2025
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 570.86.16 Driver Version: 570.86.16 CUDA
Version: 12.8 |
|-----------------------------------------+------------------------+----------------------+
| 0 N/A N/A 469044 G /usr/bin/plasmashell
1772MiB |
+-----------------------------------------------------------------------------------------+
VRAM allocations of plasmashell went from 452 MB to 1772 MB.
Overall VRAM usage went from 2062 MB to 3127 MB.
EXPECTED RESULT
plasmashell VRAM usage should not go way above the initial value, especially if
the system is left otherwise.
SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 2.17
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.1
Kernel Version: 6.12.12-gentoo (64-bit)
Graphics Platform: Wayland
Processors: 20 × 12th Gen Intel® Core™ i7-12700K
Memory: 31.1 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2
ADDITIONAL INFORMATION
I'm not sure if plasma notifications play a role here, I have multiple websites
open which are allowed to display notifications. Also, I'm using the
wallpaper-of-the-day features which changes the wallpaper every so often. The
wallpaper probably changed only once so it should not have a big impact.
Monitor setup, none rotated, HDR disabled, VRR auto:
1. Left, 16:18 2560x2880, plasma bar at the left
2. Center, 16:9 3840x2160, plasma bar at the bottom
3. Right, 16:9 3840x2160, plasma bar at the right
4. TV, clone of (2), 3840x2160
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