Ticket #19641 (new defect)

Opened 2 years ago

Last modified 16 months ago

Assigning more vCPU (within the physical core limits) causes random freezes on guests

Reported by: LienCaspari Owned by:
Component: VMM Version: VirtualBox 6.1.8
Keywords: freeze, linux, cpu, core, intel Cc:
Guest type: Linux Host type: Linux


Host Info

Host: Fedora 32 (64 bit)

CPU: Intel® Core™ i9-9880H CPU @ 2.30GHz × 8 Cores

GPU: Intel UHD-630

HyperThreading: Disabled

Physical Cores: 8

VirtualBox Version: 6.1.8

Display Protocol: X11

Guest Info

Guest: Debian 10 (Kernel 4.19.0-9-amd64) (Also reproducible in Kubuntu 20.04)

Display Adapter: VMSVGA

3D Acceleration: Enabled

VBox Guest Additions: Installed

When I assign 4 cores to the guest, on random starts the guest's animation and scrolling lags. When I checked the Session Information it showed Guest Load about ~0-1% and VMM Load about ~25%. The next restart of the guest doesn't have this behavior. Guest is smooth and doesn't cause pauses.

I tried changing few settings to find the root cause of the issue and surprisingly reducing the CPU count to 1 or 2 fixes the issue. The issue was not reproducible at all.

Change History

comment:1 Changed 16 months ago by aim

My configuration is Intel® Core™ i5-8257U Processor # of Cores 4 # of Threads 8

When I assign 7 cores to a linux guest it shows 80-90% VMM load

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