Event Frequency vs. CPU Frequency

• Fills CPU’s idle time with useful work from another (host) thread

• Maximizes event frequency by eliminating context switches

• Benefit depends on event speed, CPU throughput and context switch time

Interrupt-Driven

Guest Events

Busy Waiting

Thread Integration

1 CPU

Instruction

per box

Guest

Code

Guest

Busy Waiting

Context

Switching

Background

or Host Code

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