Opened 4 years ago
Last modified 3 years ago
#19641 new defect
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 |
Description
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.
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