Fedora Guest OS low CPU usage

Discussions about using Linux guests in VirtualBox.

Fedora Guest OS low CPU usage

Postby iovan » 13. Nov 2017, 13:40

While many complain about high CPU usage from their guest OS, I want it to use more and it doesn't.
I'm talking about a Fedora 19 installation running in an up to date Virtual Box environment, I tried both under Win10 host and Ubuntu 16.04 host OS. I got the same results.

The guest - Fedora - does not use more than 50% CPU from the host machine even if I want to.

The Virtual Box>Settings>System>Processor>Execution Cap is set to 100%, while "Processors" number is set to the maximum numbers of physical cores the host has (2 or 4 in my cases).

Can I make the guest use 100% CPU when needed?
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Re: Fedora Guest OS low CPU usage

Postby mpack » 13. Nov 2017, 14:47

Please provide a VM log file. With the VM fully shut down, right click it in the GUI. Select "Show Log" and save "VBox.log" (ONLY) to a zip file. Attach the zip here.
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Re: Fedora Guest OS low CPU usage

Postby barbiani » 12. Apr 2021, 01:10

Same thing here with windows 10 host and kali as guest.

htop shows 2 cpus at 100% while windows task manager 4 threads at 65%.
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