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Interrupt latency is the total delay experienced by a device from the time it raises an interrupt to the time its interrupt service routine begins to execute.The delay introduced can be any one or all of the following below reasons:

• Time the processor takes to complete the current instruction,do the necessary chores(e.g flush the instruction pipeline and read the interrupt vector) and jump to the trap handler and interrurpt dispatcher part of the kernal
• Time kernal takes to disable the external interrupts
• Time required to complete the immediate ISR of higher priority interrupts if any
• Time the kernal takes to save the context of the interrupted thread,identify the interrupting device, and get the starting address of ISR

The sum of all the above factors is called Interrupt latency.

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This entry was written by Pratap Nirujogi and posted on October 31, 2006 at 5:47 pm and filed under Question Patterns. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL.