Write it at the front

There are many sources of overhead in a virtualized environment , Finding these sources requires top-down and bottom-up analysis .

stay QNX Hypervisor In the system , The sources of expenses include the following ：

Guest sign out （Guest Exits）

These happen when a virtualization event requires Guest Leave the local environment （ That is to say, quit ）. These events include Hypervisor Check and delivery interruption , Manage privileged operations , For example, update register . You can configure your Guest OS To reduce these events . So that they don't need to be triggered to exit .（ Reference resources “Guest-triggered exits” Of  “Guest exits”）

interrupt （Interrupts）

Whether they come from hardware , Or directly from Guest Request ,Hypervisor Each interrupt in the system needs Guest sign out , In order to Hypervisor You can manage them . This means that the cost of interruption may be significantly higher than that of non virtualized systems （ For example, use virtual devices when appropriate ）, And reduce the cost of necessary interruptions by using hardware virtualization support . Reference resources “