Abstract: Apparatus and a method for monitoring the time for a computer to process a process associated with an interrupt asserted on a system bus. When the interrupt is asserted, a time stamp value and data associated with the interrupt are stored in one of a plurality of registers. The data associated with the interrupt include an identification of the type of interrupt, the bus, and a device asserting the interrupt. Whenever a time stamp value and associated data are stored in a register, a flag is set ON to indicate information is stored therein. The time stamp value and associated data are stored in an overflow register if every other register is in use. A latency value for the interrupt is determined from the difference between the time stamp value stored in a register and the time when processing of the interrupt process is complete.