High idle CPU usage with PulseAudio in Linux #129162
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Reference: blender/blender#129162
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System Information
Operating system: Linux-6.10.11+bpo-amd64-x86_64-with-glibc2.36 64 Bits, WAYLAND UI
Graphics card: AMD Radeon Graphics (gfx1103_r1, LLVM 15.0.6, DRM 3.57, 6.10.11+bpo-amd64) AMD 4.6 (Core Profile) Mesa 22.3.6
Blender Version
Broken: version: 4.3.0 Beta, branch: blender-v4.3-release, commit date: 2024-10-16 22:01, hash:
9222ce24f506
Worked: 4.2.3
Short description of error
Blender shows a very high CPU usage in idle state since starting. The
pipewire-pulse
process also shows high CPU usage.Exact steps for others to reproduce the error
High CPU usage starts just after opening Blender from a fresh downloaded protable. No further actions are necessary.
Detailed information
Linux distribution: Debian 12.7, with backports 6.10 kernel.
The high CPU usage from Blender and from pipewire-pulse seem related. When other audio devices are chosen in Preferences->System->Sound, the CPU usage drops drastically.
Idle CPU usage with different audio devices in Blender:
This high CPU usage with pulseaudio is not present in Blender 4.2.3. However, in that version, a reduction in idle CPU usage is still observed when switching the audio device from pulseaudio to JACK, SDL or None (from 4% CPU usage to 2%).
I don't have another linux box to try, so I can't tell if it is a quirk from my setup.
I can confirm the higher idle CPU usage here, with numbers almost exactly matching yours (I was using
top
to monitor CPU usage).I will mark as high severity as it is a regression. And will look into bisecting.
System Information
Operating system: Linux-6.8.0-45-generic-x86_64-with-glibc2.39 64 Bits, WAYLAND UI
Graphics card: AMD Radeon RX 7800 XT (radeonsi, navi32, LLVM 18.1.7, DRM 3.57, 6.8.0-45-generic) AMD 4.6 (Core Profile) Mesa 24.2.0-devel
Bisecting points to
a235a18aca
as the cause.CC @neXyon and @ZedDB?
@neXyon You seem to have commited the fix to main, but not the Blender 4.3 branch (which is also impacted).
Are you able to fix this by: