Virtualbox can only use one core with isolcpus

[seide]

On our server we installed isolcpus to dedicate our cpus for special tasks. Unfortunately it is not possible to assign virtualbox for more than one core with

taskset -c 4,5,6,7 VBoxManage starvm "[vm_name]" --type headless

If we start the virtual machine only with

VBoxManage starvm "[vm_name]" --type headless

the virtual machine runs on core 0-3.

After we uninstalled isolcpus we can use taskset to assign certain cpus.

[Frank Mehnert]

VirtualBox is a normal application so you need to find out how this works on Linux. For instance, your taskset command line looks suspicious to me as not 'VBoxManage' should be executed on dedicated CPUs but the VBoxHeadless process which is started by VBoxManage.