High CPU utilization Windows 7 Ultimate on Virtualbox on Macbook Pro

[elzorro]

Macbook Pro Retina 15-inch Mid 2015 OS X El Capitan 10.11.3 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3 Iris Intel Pro 1536 1 TB SSD

Virtualbox Version 5.0.14 r105127 for OS X

Windows 7 Ultimate 64bits running as a virtual machine 4 CPUs 4 GB RAM 200 GB hard disk PA/NX Enabled VT-x/AMD-V enabled Nested Paging enabled

Problem: High CPU utilization 120% or more at random for long period of time reported for "Virtualbox VM" process in Activity Monitor even with Windows not performing any user's task. Fan speed increases loud and temperature increases. Goes worst to 200%+ or more with Youtube video for instance or even browsing.

This is a snapshot if I click on the "Virtualbox VM" task The process group is made of: kernel_task(0) %CPU 2.76 launchd(1) %CPU 0 VboxSvc %CPU 0.28 Virtualbox VM %CPU 125%

The %CPU fluctuates from high to low and then high staying random time at each %

Any log you will need or additional information?, please let know.

I have spent weeks searching in forums and found no match for High CPU for the "Virtualbox VM" process, found for kernel and other processes but in the case I am reporting those other cases the processes in my laptop are normal.

I would like to report that I also have Windows 7 Ultimate 64 bits (same patch level as the one running in Virtualbox) running as a VM with the same configuration, CPU, RAM and disk size in VMWare Fusion Pro 8.1.0 in the same Macbook Pro and I do not see the High CPU problem described here for Virtualbox.

[Frank Mehnert]

Please provide a VBox.log file of such a VM session.