What is the meaning of Interrupt latency

[Urvashi]

Interrupt latency is the time elapsed between which of foll?
A)Occurance of an interrupt & its detection by the CPU
b)Assertion of an interrupt & the start of the associated ISR
C)Assertion of an interrupt & the completion of the associated ISR
d)start & completion associated ISR
please reply

 

[FoxyRick]

It is (b).

From Wikipedia: interrupt latency is the time between the generation of an interrupt by a device and the servicing of the device which generated the interrupt.

Put another way, interrupt latency is defined as the elapsed time between the assertion of an interrupt and the execution of the first instruction in the interrupt service routine.